diff --git a/README.md b/README.md
index b4c246f..c0beae7 100644
--- a/README.md
+++ b/README.md
@@ -1,14 +1,27 @@
-# Universal OJ
+<p align="center"><img src="https://github.com/UniversalOJ/UOJ-System/blob/master/web/images/logo.png?raw=true"></p>
 
-这是一份民间的UOJ版本，我们希望它比官方版本更易用。
+# Universal Online Judge
 
-部署文档在[universaloj.github.io](https://universaloj.github.io)。
+> #### 一款通用的在线评测系统。
 
+## 特性
 
-目前已经支持的特性：  
+- 前后端全面更新为 Bootstrap 4 + PHP 7。
+- 多种部署方式，各取所需、省心省力、方便快捷。
+- 各组成部分可单点部署，也可分离部署；支持添加多个评测机。
+- 题目搜索，全局放置，任意页面均可快速到达。
+- 所有题目从编译、运行到评分，都可以由出题人自定义。
+- 引入 Extra Tests 和 Hack 机制，更加严谨、更有乐趣。
+- 支持 OI/IOI/ACM 等比赛模式；比赛内设有提问区域。
+- 博客功能，不仅可撰写图文内容，也可制作幻灯片。
 
-- 子目录博客（感谢[roastduck](https://github.com/roastduck/)的贡献）
-- zip传题  （感谢[AD1024](https://github.com/AD1024/)的贡献）
+## 文档
 
+有关安装、管理、维护，可参阅：[https://universaloj.github.io/](https://universaloj.github.io/)
+
+## 感谢
+
+- [vfleaking](https://github.com/vfleaking) 将 UOJ 代码[开源](https://github.com/vfleaking/uoj)
+- 向原项目或本项目贡献代码的人
+- 给我们启发与灵感以及提供意见和建议的人
 
-希望对您有帮助。
\ No newline at end of file
diff --git a/web/app/controllers/blogs.php b/web/app/controllers/blogs.php
index 67bce28..3c0e136 100644
--- a/web/app/controllers/blogs.php
+++ b/web/app/controllers/blogs.php
@@ -20,9 +20,9 @@ EOD;
 ?>
 <?php echoUOJPageHeader(UOJLocale::get('blogs')) ?>
 <?php if (Auth::check()): ?>
-<div class="pull-right">
+<div class="float-right">
 	<div class="btn-group">
-		<a href="<?= HTML::blog_url(Auth::id(), '/') ?>" class="btn btn-default btn-sm">我的博客首页</a>
+		<a href="<?= HTML::blog_url(Auth::id(), '/') ?>" class="btn btn-secondary btn-sm">我的博客首页</a>
 		<a href="<?= HTML::blog_url(Auth::id(), '/post/new/write')?>" class="btn btn-primary btn-sm"><span class="glyphicon glyphicon-edit"></span> 写新博客</a>
 	</div>
 </div>
diff --git a/web/app/controllers/change_user_info.php b/web/app/controllers/change_user_info.php
index 477754b..c9d3c79 100644
--- a/web/app/controllers/change_user_info.php
+++ b/web/app/controllers/change_user_info.php
@@ -124,7 +124,7 @@
 	</div>
 	<div class="form-group">
 		<div class="col-sm-offset-2 col-sm-3">
-			<button type="submit" id="button-submit" class="btn btn-default"><?= UOJLocale::get('submit') ?></button>
+			<button type="submit" id="button-submit" class="btn btn-secondary"><?= UOJLocale::get('submit') ?></button>
 		</div>
 	</div>
 </form>
diff --git a/web/app/controllers/contest_inside.php b/web/app/controllers/contest_inside.php
index dfa3f1e..8c6d972 100644
--- a/web/app/controllers/contest_inside.php
+++ b/web/app/controllers/contest_inside.php
@@ -410,11 +410,11 @@ EOD;
 	 	$time_str = UOJTime::$time_now_str;
 	 	$contest_ends_in = UOJLocale::get('contests::contest ends in');
 	 	echo <<<EOD
- 		<div class="panel panel-info">
- 			<div class="panel-heading">
- 				<h3 class="panel-title">$contest_ends_in</h3>
+ 		<div class="card border-info">
+ 			<div class="card-header bg-info">
+ 				<h3 class="card-title">$contest_ends_in</h3>
  			</div>
- 			<div class="panel-body text-center countdown" data-rest="$rest_second"></div>
+ 			<div class="card-body text-center countdown" data-rest="$rest_second"></div>
  		</div>
 		<script type="text/javascript">
 			checkContestNotice({$contest['id']}, '$time_str');
@@ -434,11 +434,11 @@ EOD;
 			$title = UOJLocale::get('contests::contest final testing');
 		}
 		echo <<<EOD
- 		<div class="panel panel-info">
- 			<div class="panel-heading">
- 				<h3 class="panel-title">$title</h3>
+ 		<div class="card border-info">
+ 			<div class="card-header bg-info">
+ 				<h3 class="card-title">$title</h3>
  			</div>
- 			<div class="panel-body">
+ 			<div class="card-body">
 				<div class="progress bot-buffer-no">
 					<div class="progress-bar progress-bar-success" role="progressbar" aria-valuenow="$rop" aria-valuemin="0" aria-valuemax="100" style="width: {$rop}%; min-width: 20px;">{$rop}%</div>
 				</div>
@@ -450,9 +450,9 @@ EOD;
 	function echoContestFinished() {
 		$title = UOJLocale::get('contests::contest ended');
 		echo <<<EOD
- 		<div class="panel panel-info">
- 			<div class="panel-heading">
- 				<h3 class="panel-title">$title</h3>
+ 		<div class="card border-info">
+ 			<div class="card-header bg-info">
+ 				<h3 class="card-title">$title</h3>
  			</div>
  		</div>
 EOD;
@@ -534,12 +534,12 @@ EOD;
 			<?php if ($cur_tab == 'standings'): ?>
 	</div>
 	<div class="col-sm-3">
-		<div class="panel panel-info">
+		<div class="card border-info">
 		<?php else: ?>
-		<div class="panel panel-info top-buffer-lg">
+		<div class="card border-info top-buffer-lg">
 		<?php endif ?>
-			<div class="panel-heading">
-				<h3 class="panel-title">比赛资料</h3>
+			<div class="card-header bg-info">
+				<h3 class="card-title">比赛资料</h3>
 			</div>
 			<div class="list-group">
 			<?php foreach ($contest['extra_config']['links'] as $link) { ?>
diff --git a/web/app/controllers/contest_manage.php b/web/app/controllers/contest_manage.php
index 362320d..465f08b 100644
--- a/web/app/controllers/contest_manage.php
+++ b/web/app/controllers/contest_manage.php
@@ -198,14 +198,14 @@
 ?>
 <?php echoUOJPageHeader(HTML::stripTags($contest['name']) . ' - 比赛管理') ?>
 <h1 class="page-header" align="center"><?=$contest['name']?> 管理</h1>
-<ul class="nav nav-tabs" role="tablist">
-	<li class="active"><a href="#tab-time" role="tab" data-toggle="tab">比赛时间</a></li>
-	<li><a href="#tab-managers" role="tab" data-toggle="tab">管理者</a></li>
-	<li><a href="#tab-problems" role="tab" data-toggle="tab">试题</a></li>
+<ul class="nav nav-tabs mb-3" role="tablist">
+	<li class="nav-item"><a class="nav-link active" href="#tab-time" role="tab" data-toggle="tab">比赛时间</a></li>
+	<li class="nav-item"><a class="nav-link" href="#tab-managers" role="tab" data-toggle="tab">管理者</a></li>
+	<li class="nav-item"><a class="nav-link" href="#tab-problems" role="tab" data-toggle="tab">试题</a></li>
 	<?php if (isSuperUser($myUser)): ?>
-	<li><a href="#tab-others" role="tab" data-toggle="tab">其它</a></li>
+	<li class="nav-item"><a class="nav-link" href="#tab-others" role="tab" data-toggle="tab">其它</a></li>
 	<?php endif ?>
-	<li><a href="/contest/<?=$contest['id']?>" role="tab">返回</a></li>
+	<li class="nav-item"><a class="nav-link" href="/contest/<?=$contest['id']?>" role="tab">返回</a></li>
 </ul>
 <div class="tab-content top-buffer-sm">
 	<div class="tab-pane active" id="tab-time">
diff --git a/web/app/controllers/contest_members.php b/web/app/controllers/contest_members.php
index 6de75e2..a37934d 100644
--- a/web/app/controllers/contest_members.php
+++ b/web/app/controllers/contest_members.php
@@ -49,7 +49,7 @@
 <h1 class="text-center"><?= $contest['name'] ?></h1>
 <?php if ($contest['cur_progress'] == CONTEST_NOT_STARTED): ?>
 	<?php if ($iHasRegistered): ?>
-		<div class="pull-right">
+		<div class="float-right">
 			<?php $unregister_form->printHTML(); ?>
 		</div>
 		<div><a style="color:green">已报名</a></div>
diff --git a/web/app/controllers/faq.php b/web/app/controllers/faq.php
index 3d1dc1e..4b7f60d 100644
--- a/web/app/controllers/faq.php
+++ b/web/app/controllers/faq.php
@@ -8,181 +8,201 @@
 		<h2 class="page-header">常见问题及其解答(FAQ)</h2>
 	</header>
 	<section>
-		<header>
-			<h4><a data-toggle="collapse" href="#collapseOne">1. 什么是<?= UOJConfig::$data['profile']['oj-name-short'] ?></a></h4>
-		</header>
-		<div id="collapseOne" class="collapse">
-			<p>来了？坐，欢迎来到 <?= UOJConfig::$data['profile']['oj-name'] ?>。</p>
-			<p><img src="https://tb2.bdstatic.com/tb/editor/images/qpx_n/b37.gif?t=20140803" alt="小熊像超人一样飞" /></p>
-			<p>众所周知，信息学的题目一般形式为：给出XXXXX，要你提交一份源代码，输出XXXXX，然后时限若干秒，内存若干兆，数据若干组，每组数据与答案进行比较，不对就不给分。</p>
-			<p>看起来挺合理的，但是总是有意外。比如要求输出一个浮点数，与答案接近就满分。于是只好引入Special Judge来判断选手输出的正确性。</p>
-			<p>但是还是有意外，比如提交两个程序，一个压缩另一个解压；比如提交答案题只用提交文件；比如给出音乐要求识别乐器，达到90%的正确率就算满分……</p>
-			<p>这个时候UOJ出现了，于是<?= UOJConfig::$data['profile']['oj-name-short'] ?>就使用了这套系统。Universal的中文意思是通用，之所以称之为UOJ，因为我们所有题目从编译、运行到评分，都可以由出题人自定义。</p>
-			<p>如果你正在为没有地方测奇奇怪怪的题目而苦恼，那么你来对地方了。</p>
-			<p>当然了，<?= UOJConfig::$data['profile']['oj-name-short'] ?>对于传统题的评测也做了特别支持。平时做题时我很难容忍的地方就是数据出水了导致暴力得了好多分甚至过了，而出题人却委屈地说，总共才一百分，卡了这个暴力就不能卡另一个暴力，所以暴力过了就过了吧。</p>
-			<p>所以我们引入了Extra Tests和Hack机制。每道传统题的数据都分为Tests和Extra Tests，Tests满分100分，如果你通过了所有的Tests，那么就会为你测Extra Tests。如果过了Tests但没过Extra Tests那么倒扣3分变为97分。Extra Tests的来源，一个是这道题没什么人可能会错的边界情况可以放在里面，另一个就是各位平时做题的时候，如果发现错误算法AC了，可以使用hack将其卡掉，<?= UOJConfig::$data['profile']['oj-name-short'] ?>会自动加入Extra Tests并重测。我们无法阻止暴力高分的脚步，但是不让他得满分还是有心里安慰作用的～</p>
-			<p><?= UOJConfig::$data['profile']['oj-name-short'] ?>还有比赛功能可以承办比赛，赛制暂时只支持OI赛制。（不过你可以利用现有方案变相实现ACM赛制！）未来将支持更多种多样的赛制甚至自定义赛制。</p>
-			<p>目前<?= UOJConfig::$data['profile']['oj-name-short'] ?>刚刚起步，还有很多地方有待完善。想出题、想出比赛、发现BUG、发现槽点都可以联系我们，联系方式见下。</p>
-			<p>祝各位在<?= UOJConfig::$data['profile']['oj-name-short'] ?>玩得愉快！（求不虐萌萌哒服务器～求不虐萌萌哒测评机～！）</p>
-			<p><img src="https://tb2.bdstatic.com/tb/editor/images/qpx_n/b54.gif?t=20140803" alt="小熊抱抱" /></p>
+		<div class="card my-1">
+			<div class="card-header collapsed" id="headerOne" data-toggle="collapse" data-target="#collapseOne" style="cursor:pointer;">
+				<h5 class="mb-0">什么是<?= UOJConfig::$data['profile']['oj-name-short'] ?></h5>
+			</div>
+			<div id="collapseOne" class="collapse">
+				<div class="card-body">
+					<p>来了？坐，欢迎来到 <?= UOJConfig::$data['profile']['oj-name'] ?>。</p>
+					<p><img src="https://tb2.bdstatic.com/tb/editor/images/qpx_n/b37.gif?t=20140803" alt="小熊像超人一样飞" /></p>
+					<p>众所周知，信息学的题目一般形式为：给出XXXXX，要你提交一份源代码，输出XXXXX，然后时限若干秒，内存若干兆，数据若干组，每组数据与答案进行比较，不对就不给分。</p>
+					<p>看起来挺合理的，但是总是有意外。比如要求输出一个浮点数，与答案接近就满分。于是只好引入Special Judge来判断选手输出的正确性。</p>
+					<p>但是还是有意外，比如提交两个程序，一个压缩另一个解压；比如提交答案题只用提交文件；比如给出音乐要求识别乐器，达到90%的正确率就算满分……</p>
+					<p>这个时候UOJ出现了，于是<?= UOJConfig::$data['profile']['oj-name-short'] ?>就使用了这套系统。Universal的中文意思是通用，之所以称之为UOJ，因为我们所有题目从编译、运行到评分，都可以由出题人自定义。</p>
+					<p>如果你正在为没有地方测奇奇怪怪的题目而苦恼，那么你来对地方了。</p>
+					<p>当然了，<?= UOJConfig::$data['profile']['oj-name-short'] ?>对于传统题的评测也做了特别支持。平时做题时我很难容忍的地方就是数据出水了导致暴力得了好多分甚至过了，而出题人却委屈地说，总共才一百分，卡了这个暴力就不能卡另一个暴力，所以暴力过了就过了吧。</p>
+					<p>所以我们引入了Extra Tests和Hack机制。每道传统题的数据都分为Tests和Extra Tests，Tests满分100分，如果你通过了所有的Tests，那么就会为你测Extra Tests。如果过了Tests但没过Extra Tests那么倒扣3分变为97分。Extra Tests的来源，一个是这道题没什么人可能会错的边界情况可以放在里面，另一个就是各位平时做题的时候，如果发现错误算法AC了，可以使用hack将其卡掉，<?= UOJConfig::$data['profile']['oj-name-short'] ?>会自动加入Extra Tests并重测。我们无法阻止暴力高分的脚步，但是不让他得满分还是有心里安慰作用的～</p>
+					<p><?= UOJConfig::$data['profile']['oj-name-short'] ?>还有比赛功能可以承办比赛，赛制暂时只支持OI赛制。（不过你可以利用现有方案变相实现ACM赛制！）未来将支持更多种多样的赛制甚至自定义赛制。</p>
+					<p>目前<?= UOJConfig::$data['profile']['oj-name-short'] ?>刚刚起步，还有很多地方有待完善。想出题、想出比赛、发现BUG、发现槽点都可以联系我们，联系方式见下。</p>
+					<p>祝各位在<?= UOJConfig::$data['profile']['oj-name-short'] ?>玩得愉快！（求不虐萌萌哒服务器～求不虐萌萌哒测评机～！）</p>
+					<p><img src="https://tb2.bdstatic.com/tb/editor/images/qpx_n/b54.gif?t=20140803" alt="小熊抱抱" /></p>
+				</div>
+			</div>
 		</div>
-	</section>
-	<section>
-		<header>
-			<h4><a data-toggle="collapse" href="#collapseTwo">2. 注册后怎么上传头像</a></h4>
-		</header>
-		<div id="collapseTwo" class="collapse">
-			<p><?= UOJConfig::$data['profile']['oj-name-short'] ?>不提供头像存储服务。每到一个网站都要上传一个头像挺烦的对不对？我们支持Gravatar，请使用Gravatar吧！Gravatar是一个全球的头像存储服务，你的头像将会与你的电子邮箱绑定。在各大网站比如各种Wordpress还有各种OJ比如Vijos、Contest Hunter上，只要你电子邮箱填对了，那么你的头像也就立即能显示了！</p>
-			<p>快使用Gravatar吧！ Gravatar地址：<a href="https://cn.gravatar.com/">https://cn.gravatar.com/</a>。进去后注册个帐号然后与邮箱绑定并上传头像，就ok啦！</p>
+		<div class="card my-1">
+			<div class="card-header collapsed" id="headerTwo" data-toggle="collapse" data-target="#collapseTwo" style="cursor:pointer;">
+				<h5 class="mb-0">注册后怎么上传头像</h5>
+			</div>
+			<div id="collapseTwo" class="collapse">
+				<div class="card-body">
+					<p><?= UOJConfig::$data['profile']['oj-name-short'] ?>不提供头像存储服务。每到一个网站都要上传一个头像挺烦的对不对？我们支持Gravatar，请使用Gravatar吧！Gravatar是一个全球的头像存储服务，你的头像将会与你的电子邮箱绑定。在各大网站比如各种Wordpress还有各种OJ比如Vijos、Contest Hunter上，只要你电子邮箱填对了，那么你的头像也就立即能显示了！</p>
+					<p>快使用Gravatar吧！ Gravatar地址：<a href="https://cn.gravatar.com/">https://cn.gravatar.com/</a>。进去后注册个帐号然后与邮箱绑定并上传头像，就ok啦！</p>
+				</div>
+			</div>
 		</div>
-	</section>
-	<section>
-		<header>
-			<h4><a data-toggle="collapse" href="#collapseThree">3. <?= UOJConfig::$data['profile']['oj-name-short'] ?>的测评环境？</a></h4>
-		</header>
-		<div id="collapseThree" class="collapse">
-			<p>默认的测评环境是 Ubuntu Linux 18.04 LTS x64。</p>
-			<p>C的编译器是 gcc 7.4.0，编译命令：<code>gcc code.c -o code -lm -O2 -DONLINE_JUDGE</code>。</p>
-			<p>C++的编译器是 g++ 7.4.0，编译命令：<code>g++ code.cpp -o code -lm -O2 -DONLINE_JUDGE</code>。如果选择C++11会在编译命令后面添加<code>-std=c++11</code>。</p>
-			<p>Java8的JDK版本是 openjdk 1.8.0_212，编译命令：<code>javac code.java</code>。</p>
-			<p>Java11的JDK版本是 openjdk 11.0.3，编译命令：<code>javac code.java</code>。</p>
-			<p>Pascal的编译器是 fpc 3.0.4，编译命令：<code>fpc code.pas -O2</code>。</p>
-			<p>Python会先编译为优化过的字节码<samp>.pyo</samp>文件。支持的Python版本分别为Python 2.7和3.6。</p>
+		<div class="card my-1">
+			<div class="card-header collapsed" id="headerThree" data-toggle="collapse" data-target="#collapseThree" style="cursor:pointer;">
+				<h5 class="mb-0"><?= UOJConfig::$data['profile']['oj-name-short'] ?>的测评环境？</h5>
+			</div>
+			<div id="collapseThree" class="collapse">
+				<div class="card-body">
+					<p>默认的测评环境是 Ubuntu Linux 18.04 LTS x64。</p>
+					<p>C的编译器是 gcc 7.4.0，编译命令：<code>gcc code.c -o code -lm -O2 -DONLINE_JUDGE</code>。</p>
+					<p>C++的编译器是 g++ 7.4.0，编译命令：<code>g++ code.cpp -o code -lm -O2 -DONLINE_JUDGE</code>。如果选择C++11会在编译命令后面添加<code>-std=c++11</code>。</p>
+					<p>Java8的JDK版本是 openjdk 1.8.0_212，编译命令：<code>javac code.java</code>。</p>
+					<p>Java11的JDK版本是 openjdk 11.0.3，编译命令：<code>javac code.java</code>。</p>
+					<p>Pascal的编译器是 fpc 3.0.4，编译命令：<code>fpc code.pas -O2</code>。</p>
+					<p>Python会先编译为优化过的字节码<samp>.pyo</samp>文件。支持的Python版本分别为Python 2.7和3.6。</p>
+				</div>
+			</div>
 		</div>
-	</section>
-	<section>
-		<header>
-			<h4><a data-toggle="collapse" href="#collapseFour">4. 各种评测状态的鸟语是什么意思？</a></h4>
-		</header>
-		<div id="collapseFour" class="collapse">
-			<ul>
-				<li>Accepted: 答案正确。恭喜大佬，您通过了这道题。</li>
-				<li>Wrong Answer: 答案错误。仅仅通过样例数据的测试并不一定是正确答案，一定还有你没想到的地方。</li>
-				<li>Runtime Error: 运行时错误。像非法的内存访问，数组越界，指针漂移，调用禁用的系统函数都可能出现这类问题，请点击评测详情获得输出。</li>
-				<li>Time Limit Exceeded: 时间超限。请检查程序是否有死循环，或者应该有更快的计算方法。</li>
-				<li>Memory Limit Exceeded: 内存超限。数据可能需要压缩，或者您数组开太大了，请检查是否有内存泄露。</li>
-				<li>Output Limit Exceeded: 输出超限。你的输出居然比正确答案长了两倍！</li>
-				<li>Dangerous Syscalls: 危险系统调用，你是不是带了文件，或者使用了某些有意思的system函数？</li>
-				<li>Judgement Failed: 评测失败。可能是评测机抽风了，也可能是服务器正在睡觉；反正不一定是你的锅啦！</li>
-				<li>No Comment: 没有详情。评测机对您的程序无话可说，那么我们也不知道到底发生了什么...</li>
-			</ul>
+		<div class="card my-1">
+			<div class="card-header collapsed" id="headerFour" data-toggle="collapse" data-target="#collapseFour" style="cursor:pointer;">
+				<h5 class="mb-0">各种评测状态的鸟语是什么意思？</h5>
+			</div>
+			<div id="collapseFour" class="collapse">
+				<div class="card-body">
+					<ul>
+						<li>Accepted: 答案正确。恭喜大佬，您通过了这道题。</li>
+						<li>Wrong Answer: 答案错误。仅仅通过样例数据的测试并不一定是正确答案，一定还有你没想到的地方。</li>
+						<li>Runtime Error: 运行时错误。像非法的内存访问，数组越界，指针漂移，调用禁用的系统函数都可能出现这类问题，请点击评测详情获得输出。</li>
+						<li>Time Limit Exceeded: 时间超限。请检查程序是否有死循环，或者应该有更快的计算方法。</li>
+						<li>Memory Limit Exceeded: 内存超限。数据可能需要压缩，或者您数组开太大了，请检查是否有内存泄露。</li>
+						<li>Output Limit Exceeded: 输出超限。你的输出居然比正确答案长了两倍！</li>
+						<li>Dangerous Syscalls: 危险系统调用，你是不是带了文件，或者使用了某些有意思的system函数？</li>
+						<li>Judgement Failed: 评测失败。可能是评测机抽风了，也可能是服务器正在睡觉；反正不一定是你的锅啦！</li>
+						<li>No Comment: 没有详情。评测机对您的程序无话可说，那么我们也不知道到底发生了什么...</li>
+					</ul>
+				</div>
+			</div>
 		</div>
-	</section>
-	<section>
-		<header>
-			<h4><a data-toggle="collapse" href="#collapseFive">5. 递归 10<sup>7</sup> 层怎么没爆栈啊</a></h4>
-		</header>
-		<div id="collapseFive" class="collapse">
-			<p>没错就是这样！除非是特殊情况，<?= UOJConfig::$data['profile']['oj-name-short'] ?>测评程序时的栈大小与该题的空间限制是相等的！</p>
+		<div class="card my-1">
+			<div class="card-header collapsed" id="headerFive" data-toggle="collapse" data-target="#collapseFive" style="cursor:pointer;">
+				<h5 class="mb-0">递归 10<sup>7</sup> 层怎么没爆栈啊</h5>
+			</div>
+			<div id="collapseFive" class="collapse">
+				<div class="card-body">
+					<p>没错就是这样！除非是特殊情况，<?= UOJConfig::$data['profile']['oj-name-short'] ?>测评程序时的栈大小与该题的空间限制是相等的！</p>
+				</div>
+			</div>
 		</div>
-	</section>
-	<section>
-		<header>
-			<h4><a data-toggle="collapse" href="#collapseSix">6. 我在本地/某某OJ上AC了，但在<?= UOJConfig::$data['profile']['oj-name-short'] ?>却过不了...这咋办？</a></h4>
-		</header>
-		<div id="collapseSix" class="collapse">
-			<p>对于这类问题，我们在这里简单列一下可能原因：</p>
-			<ul>
-				<li>Linux中换行符是'\n'而windows中是'\r\n'（多一个字符）。有些数据在Windows下生成，而<?= UOJConfig::$data['profile']['oj-name-short'] ?>评测环境为Linux系统。这种情况在字符串输入中非常常见。</li>
-				<li>评测系统建立在Linux下，可能由于使用了Linux的保留字而出现CE，但在Windows下正常。</li>
-				<li>Linux对内存的访问控制更为严格，因此在Windows上可能正常运行的无效指针或数组下标访问越界，在评测系统上无法运行。</li>
-				<li>严重的内存泄露的问题很可能会引起系统的保护模块杀死你的进程。因此，凡是使用malloc(或calloc,realloc,new)分配而得的内存空间，请使用free(或delete)完全释放。</li>
-				<li>当然数据可能真的有问题。但是如果不止一个人通过了这道题，那最好不要怀疑是数据的锅。反之，可以立即联系我们上报！</li>
-			</ul>
+		<div class="card my-1">
+			<div class="card-header collapsed" id="headerSix" data-toggle="collapse" data-target="#collapseSix" style="cursor:pointer;">
+				<h5 class="mb-0">我在本地/某某OJ上AC了，但在<?= UOJConfig::$data['profile']['oj-name-short'] ?>却过不了...这咋办？</h5>
+			</div>
+			<div id="collapseSix" class="collapse">
+				<div class="card-body">
+					<p>对于这类问题，我们在这里简单列一下可能原因：</p>
+					<ul>
+						<li>Linux中换行符是'\n'而windows中是'\r\n'（多一个字符）。有些数据在Windows下生成，而<?= UOJConfig::$data['profile']['oj-name-short'] ?>评测环境为Linux系统。这种情况在字符串输入中非常常见。</li>
+						<li>评测系统建立在Linux下，可能由于使用了Linux的保留字而出现CE，但在Windows下正常。</li>
+						<li>Linux对内存的访问控制更为严格，因此在Windows上可能正常运行的无效指针或数组下标访问越界，在评测系统上无法运行。</li>
+						<li>严重的内存泄露的问题很可能会引起系统的保护模块杀死你的进程。因此，凡是使用malloc(或calloc,realloc,new)分配而得的内存空间，请使用free(或delete)完全释放。</li>
+						<li>当然数据可能真的有问题。但是如果不止一个人通过了这道题，那最好不要怀疑是数据的锅。反之，可以立即联系我们上报！</li>
+					</ul>
+				</div>
+			</div>
 		</div>
-	</section>
-	<section>
-		<header>
-			<h4><a data-toggle="collapse" href="#collapseSeven">7. 博客使用指南</a></h4>
-		</header>
-		<div id="collapseSeven" class="collapse">
-			<p><?= UOJConfig::$data['profile']['oj-name-short'] ?>博客使用的是Markdown。（好吧……好简陋的……好多功能还没写……）</p>
-			<p>（喂喂喂我们是OJ好吗……要那么完善的博客功能干啥呢……？）</p>
-			<p>其实我觉得Markdown不用教！一学就会！</p>
-			<p>（完蛋了……<?= UOJConfig::$data['profile']['oj-name-short'] ?>好像没有Markdown的语法高亮……= =……）</p>
-			<p>我就只介绍最基本的功能好了。其它的自己探索吧～比如<a href="http://wowubuntu.com/markdown/">这里</a>。</p>
-			<!-- readmore -->
-			<p><code>**强调**</code> = <strong>强调</strong></p>
-			<hr /><p><code>*强调*</code> = <em>强调</em></p>
-			<hr /><p><code>[<?= UOJConfig::$data['profile']['oj-name-short'] ?>](<?= HTML::url('/') ?>)</code> = <a href="<?= HTML::url('/') ?>"><?= UOJConfig::$data['profile']['oj-name-short'] ?></a></p>
-			<hr /><p><code><?= HTML::url('/') ?></code> = <a href="http://<?= UOJConfig::$data['web']['main']['host'] ?>"><?= HTML::url('/') ?></a></p>
-			<hr /><p><code>![这个文字在图挂了的时候会显示](<?= HTML::url('/pictures/UOJ.ico') ?>)</code> =
-			<img src="<?= HTML::url('/pictures/UOJ.ico') ?>" alt="这个文字在图挂了的时候会显示" /></p>
-			<hr /><p><code>`rm orz`</code> = <code>rm orz</code></p>
-			<hr /><p><code>数学公式萌萌哒$(a + b)^2$萌萌哒</code> = 数学公式萌萌哒$(a + b)^2$萌萌哒</p>
-			<hr /><p><code>&lt;!-- readmore --&gt;</code> = 在外面看这篇博客时会到此为止然后显示一个“阅读更多”字样</p>
-			<hr /><p>来个更大的例子：</p>
-			<pre>
-			```c++
-			#include &lt;iostream&gt;
-			```
+		<div class="card my-1">
+			<div class="card-header collapsed" id="headerSeven" data-toggle="collapse" data-target="#collapseSeven" style="cursor:pointer;">
+				<h5 class="mb-0">博客使用指南</h5>
+			</div>
+			<div id="collapseSeven" class="collapse">
+				<div class="card-body">
+					<p><?= UOJConfig::$data['profile']['oj-name-short'] ?>博客使用的是Markdown。（好吧……好简陋的……好多功能还没写……）</p>
+					<p>（喂喂喂我们是OJ好吗……要那么完善的博客功能干啥呢……？）</p>
+					<p>其实我觉得Markdown不用教！一学就会！</p>
+					<p>（完蛋了……<?= UOJConfig::$data['profile']['oj-name-short'] ?>好像没有Markdown的语法高亮……= =……）</p>
+					<p>我就只介绍最基本的功能好了。其它的自己探索吧～比如<a href="http://wowubuntu.com/markdown/">这里</a>。</p>
+					<!-- readmore -->
+					<p><code>**强调**</code> = <strong>强调</strong></p>
+					<hr /><p><code>*强调*</code> = <em>强调</em></p>
+					<hr /><p><code>[<?= UOJConfig::$data['profile']['oj-name-short'] ?>](<?= HTML::url('/') ?>)</code> = <a href="<?= HTML::url('/') ?>"><?= UOJConfig::$data['profile']['oj-name-short'] ?></a></p>
+					<hr /><p><code><?= HTML::url('/') ?></code> = <a href="http://<?= UOJConfig::$data['web']['main']['host'] ?>"><?= HTML::url('/') ?></a></p>
+					<hr /><p><code>![这个文字在图挂了的时候会显示](<?= HTML::url('/images/favicon.ico') ?>)</code> =
+					<img src="<?= HTML::url('/images/favicon.ico') ?>" alt="这个文字在图挂了的时候会显示" /></p>
+					<hr /><p><code>`rm orz`</code> = <code>rm orz</code></p>
+					<hr /><p><code>数学公式萌萌哒$(a + b)^2$萌萌哒</code> = 数学公式萌萌哒$(a + b)^2$萌萌哒</p>
+					<hr /><p><code>&lt;!-- readmore --&gt;</code> = 在外面看这篇博客时会到此为止然后显示一个“阅读更多”字样</p>
+					<hr /><p>来个更大的例子：</p>
+					<pre>
+					```c++
+					#include &lt;iostream&gt;
+					```
 
-			```c
-			#include &lt;stdio.h&gt;
-			```
+					```c
+					#include &lt;stdio.h&gt;
+					```
 
-			```pascal
-			begin
-			```
+					```pascal
+					begin
+					```
 
-			```python
-			print '<?= UOJConfig::$data['profile']['oj-name-short'] ?>'
-			```
+					```python
+					print '<?= UOJConfig::$data['profile']['oj-name-short'] ?>'
+					```
 
-			\begin{equation}
-			\frac{-b + \sqrt{b^2 - 4ac}}{2a}
-			\end{equation}
+					\begin{equation}
+					\frac{-b + \sqrt{b^2 - 4ac}}{2a}
+					\end{equation}
 
-			#一级标题
-			##二级标题
-			###三级标题
-			####四级标题
-			</pre>
-			<p>会转换为：</p>
-			<pre><code class="sh_cpp">#include &lt;iostream&gt;</code></pre>
-			<pre><code class="sh_c">#include &lt;stdio.h&gt;</code></pre>
-			<pre><code class="sh_pascal">begin</code></pre>
-			<pre><code class="sh_python">print '<?= UOJConfig::$data['profile']['oj-name-short'] ?>'</code></pre>
-			<p>\begin{equation}
-			\frac{-b + \sqrt{b^2 - 4ac}}{2a}
-			\end{equation}</p>
-			<h1>一级标题</h1>
-			<h2>二级标题</h2>
-			<h3>三级标题</h3>
-			<h4>四级标题</h4>
-			<hr /><p>还有一个很重要的事情，就是你很容易以为<?= UOJConfig::$data['profile']['oj-name-short'] ?>在吃换行……</p>
-			<p>那是因为跟LaTeX一样，你需要一个空行来分段。你可以粗略地认为两个换行会被替换成一换行。（当然不完全是这样，空行是用来分段的，段落还有间距啊行首空两格啊之类的属性）</p>
-			<p>唔……就介绍到这里吧。想要更详细的介绍上网搜搜吧～</p>
-			<p>（评论区是不可以用任何HTML滴～但是数学公式还是没问题滴）</p>
+					#一级标题
+					##二级标题
+					###三级标题
+					####四级标题
+					</pre>
+					<p>会转换为：</p>
+					<pre><code class="sh_cpp">#include &lt;iostream&gt;</code></pre>
+					<pre><code class="sh_c">#include &lt;stdio.h&gt;</code></pre>
+					<pre><code class="sh_pascal">begin</code></pre>
+					<pre><code class="sh_python">print '<?= UOJConfig::$data['profile']['oj-name-short'] ?>'</code></pre>
+					<p>\begin{equation}
+					\frac{-b + \sqrt{b^2 - 4ac}}{2a}
+					\end{equation}</p>
+					<h1>一级标题</h1>
+					<h2>二级标题</h2>
+					<h3>三级标题</h3>
+					<h4>四级标题</h4>
+					<hr /><p>还有一个很重要的事情，就是你很容易以为<?= UOJConfig::$data['profile']['oj-name-short'] ?>在吃换行……</p>
+					<p>那是因为跟LaTeX一样，你需要一个空行来分段。你可以粗略地认为两个换行会被替换成一换行。（当然不完全是这样，空行是用来分段的，段落还有间距啊行首空两格啊之类的属性）</p>
+					<p>唔……就介绍到这里吧。想要更详细的介绍上网搜搜吧～</p>
+					<p>（评论区是不可以用任何HTML滴～但是数学公式还是没问题滴）</p>
+				</div>
+			</div>
 		</div>
-	</section>
-	<section>
-		<header>
-			<h4><a data-toggle="collapse" href="#collapseEight">8. 交互式类型的题怎么本地测试</a></h4>
-		</header>
-		<div id="collapseEight" class="collapse">
-			<p>唔……好问题。交互式的题一般给了一个头文件要你include进来，以及一个实现接口的源文件grader。好像大家对多个源文件一起编译还不太熟悉。</p>
-			<p>对于C++：<code>g++ -o code grader.cpp code.cpp</code></p>
-			<p>对于C语言：<code>gcc -o code grader.c code.c</code></p>
-			<p>如果你是悲催的电脑盲，实在不会折腾没关系！你可以把grader的文件内容完整地粘贴到你的code的include语句之后，就可以了！</p>
-			<p>什么你是萌萌哒Pascal选手？一般来说都会给个grader，你需要写一个Pascal单元。这个grader会使用你的单元。所以你只需要把源文件取名为单元名 + <code>.pas</code>，然后：</p>
-			<p>对于Pascal语言：<code>fpc grader.pas</code></p>
-			<p>就可以啦！</p>
+		<div class="card my-1">
+			<div class="card-header collapsed" id="headerEight" data-toggle="collapse" data-target="#collapseEight" style="cursor:pointer;">
+				<h5 class="mb-0">交互式类型的题怎么本地测试</h5>
+			</div>
+			<div id="collapseEight" class="collapse">
+				<div class="card-body">
+					<p>唔……好问题。交互式的题一般给了一个头文件要你include进来，以及一个实现接口的源文件grader。好像大家对多个源文件一起编译还不太熟悉。</p>
+					<p>对于C++：<code>g++ -o code grader.cpp code.cpp</code></p>
+					<p>对于C语言：<code>gcc -o code grader.c code.c</code></p>
+					<p>如果你是悲催的电脑盲，实在不会折腾没关系！你可以把grader的文件内容完整地粘贴到你的code的include语句之后，就可以了！</p>
+					<p>什么你是萌萌哒Pascal选手？一般来说都会给个grader，你需要写一个Pascal单元。这个grader会使用你的单元。所以你只需要把源文件取名为单元名 + <code>.pas</code>，然后：</p>
+					<p>对于Pascal语言：<code>fpc grader.pas</code></p>
+					<p>就可以啦！</p>
+				</div>
+			</div>
 		</div>
-	</section>
-	<section>
-		<header>
-			<h4><a data-toggle="collapse" href="#collapseNine">9. 联系方式</a></h4>
-		</header>
-		<div id="collapseNine" class="collapse">
-			<p>如果你想出题、想办比赛、发现了BUG或者对网站有什么建议，可以通过下面的方式联系我们：</p>
-			<ul>
-				<li>私信联系<?= UOJConfig::$data['profile']['administrator'] ?>。</li>
-				<li>邮件联系<?= UOJConfig::$data['profile']['admin-email'] ?>。</li>
-				<?php if (UOJConfig::$data['profile']['QQ-group']!=''): ?>
-				<li>你也可以进QQ群水水，群号是<?= UOJConfig::$data['profile']['QQ-group'] ?>。</li>
-				<?php endif ?>
-			</ul>
+		<div class="card my-1">
+			<div class="card-header collapsed" id="headerNine" data-toggle="collapse" data-target="#collapseNine" style="cursor:pointer;">
+				<h5 class="mb-0">联系方式</h5>
+			</div>
+			<div id="collapseNine" class="collapse">
+				<div class="card-body">
+					<p>如果你想出题、想办比赛、发现了BUG或者对网站有什么建议，可以通过下面的方式联系我们：</p>
+					<ul>
+						<li>私信联系<?= UOJConfig::$data['profile']['administrator'] ?>。</li>
+						<li>邮件联系<?= UOJConfig::$data['profile']['admin-email'] ?>。</li>
+						<?php if (UOJConfig::$data['profile']['QQ-group']!=''): ?>
+						<li>你也可以进QQ群水水，群号是<?= UOJConfig::$data['profile']['QQ-group'] ?>。</li>
+						<?php endif ?>
+					</ul>
+				</div>
+			</div>
 		</div>
 	</section>
 </article>
diff --git a/web/app/controllers/hack.php b/web/app/controllers/hack.php
index 27ff28e..7c54ab8 100644
--- a/web/app/controllers/hack.php
+++ b/web/app/controllers/hack.php
@@ -60,11 +60,11 @@
 
 <?php echoHackListOnlyOne($hack, array(), $myUser) ?>
 <?php if ($should_show_all_details): ?>
-	<div class="panel panel-info">
-		<div class="panel-heading">
-			<h4 class="panel-title"><?= UOJLocale::get('details') ?></h4>
+	<div class="card border-info">
+		<div class="card-header bg-info">
+			<h4 class="card-title"><?= UOJLocale::get('details') ?></h4>
 		</div>
-		<div class="panel-body">
+		<div class="card-body">
 			<?php echoJudgementDetails($hack['details'], $styler, 'details') ?>
 			<?php if ($should_show_details_to_me): ?>
 				<?php if ($styler->fade_all_details): ?>
diff --git a/web/app/controllers/hack_list.php b/web/app/controllers/hack_list.php
index 48d8846..d6ca67a 100644
--- a/web/app/controllers/hack_list.php
+++ b/web/app/controllers/hack_list.php
@@ -42,9 +42,9 @@
 	
 ?>
 <?php echoUOJPageHeader(UOJLocale::get('hacks')) ?>
-<div class="hidden-xs">
+<div class="d-none d-sm-block">
 	<?php if ($myUser != null): ?>
-	<div class="pull-right">
+	<div class="float-right">
 		<a href="/hacks?hacker=<?= $myUser['username'] ?>" class="btn btn-success btn-sm"><?= UOJLocale::get('problems::hacks by me') ?></a>
 		<a href="/hacks?owner=<?= $myUser['username'] ?>" class="btn btn-danger btn-sm"><?= UOJLocale::get('problems::hacks to me') ?></a>
 	</div>
@@ -74,7 +74,7 @@
 				<option value="2"<?= $selected_fail ?>>Failed.</option>
 			</select>
 		</div>
-		<button type="submit" id="submit-search" class="btn btn-default btn-sm"><?= UOJLocale::get('search') ?></button>
+		<button type="submit" id="submit-search" class="btn btn-secondary btn-sm ml-2"><?= UOJLocale::get('search') ?></button>
 	</form>
 	<script type="text/javascript">
 		$('#form-search').submit(function(e) {
diff --git a/web/app/controllers/index.php b/web/app/controllers/index.php
index 6107dc7..7f72341 100644
--- a/web/app/controllers/index.php
+++ b/web/app/controllers/index.php
@@ -2,11 +2,11 @@
 	$blogs = DB::selectAll("select blogs.id, title, poster, post_time from important_blogs, blogs where is_hidden = 0 and important_blogs.blog_id = blogs.id order by level desc, important_blogs.blog_id desc limit 5");
 ?>
 <?php echoUOJPageHeader(UOJConfig::$data['profile']['oj-name-short']) ?>
-<div class="panel panel-default">
-	<div class="panel-body">
+<div class="card card-default">
+	<div class="card-body">
 		<div class="row">
 			<div class="col-sm-12 col-md-9">
-				<table class="table">
+				<table class="table table-sm">
 					<thead>
 						<tr>
 							<th style="width:60%"><?= UOJLocale::get('announcements') ?></th>
@@ -38,13 +38,13 @@
 				</table>
 			</div>
 			<div class="col-xs-6 col-sm-4 col-md-3">
-				<img class="media-object img-thumbnail" src="/pictures/UOJ.png" alt="UOJ logo" />
+				<img class="media-object img-thumbnail" src="/images/logo.png" alt="Logo" />
 			</div>
 		</div>
 	</div>
 </div>
 <div class="row">
-	<div class="col-sm-12">
+	<div class="col-sm-12 mt-4">
 		<h3><?= UOJLocale::get('top rated') ?></h3>
 		<?php echoRanklist(array('echo_full' => '', 'top10' => '')) ?>
 		<div class="text-center">
diff --git a/web/app/controllers/login.php b/web/app/controllers/login.php
index f907d06..2bc02d3 100644
--- a/web/app/controllers/login.php
+++ b/web/app/controllers/login.php
@@ -63,7 +63,7 @@
   </div>
   <div class="form-group">
     <div class="col-sm-offset-2 col-sm-3">
-      <button type="submit" id="button-submit" class="btn btn-default"><?= UOJLocale::get('submit') ?></button>
+      <button type="submit" id="button-submit" class="btn btn-secondary"><?= UOJLocale::get('submit') ?></button>
     </div>
   </div>
 </form>
diff --git a/web/app/controllers/problem.php b/web/app/controllers/problem.php
index 17ab4e9..41e116e 100644
--- a/web/app/controllers/problem.php
+++ b/web/app/controllers/problem.php
@@ -207,7 +207,16 @@ EOD
 	$REQUIRE_LIB['shjs'] = '';
 ?>
 <?php echoUOJPageHeader(HTML::stripTags($problem['title']) . ' - ' . UOJLocale::get('problems::problem')) ?>
-<div class="pull-right">
+<?php
+	$limit = getUOJConf("/var/uoj_data/{$problem['id']}/problem.conf");
+	$time_limit = $limit['time_limit'];
+	$memory_limit = $limit['memory_limit'];
+?>
+<div class="row d-flex justify-content-center">
+	<span class="badge badge-secondary mr-1">时间限制:<?=$time_limit!=null?"$time_limit s":"N/A"?></span>
+	<span class="badge badge-secondary mr-1">空间限制:<?=$memory_limit!=null?"$memory_limit MB":"N/A"?></span>
+</div>
+<div class="float-right">
 	<?= getClickZanBlock('P', $problem['id'], $problem['zan']) ?>
 </div>
 
@@ -217,7 +226,7 @@ EOD
 	<h1 class="col-md-7 text-center"><?= $problem_letter ?>. <?= $problem['title'] ?></h1>
 	<div class="col-md-2 text-right" id="contest-countdown"></div>
 </div>
-<a role="button" class="btn btn-info pull-right" href="/contest/<?= $contest['id'] ?>/problem/<?= $problem['id'] ?>/statistics"><span class="glyphicon glyphicon-stats"></span> <?= UOJLocale::get('problems::statistics') ?></a>
+<a role="button" class="btn btn-info float-right" href="/contest/<?= $contest['id'] ?>/problem/<?= $problem['id'] ?>/statistics"><span class="glyphicon glyphicon-stats"></span> <?= UOJLocale::get('problems::statistics') ?></a>
 <?php if ($contest['cur_progress'] <= CONTEST_IN_PROGRESS): ?>
 <script type="text/javascript">
 checkContestNotice(<?= $contest['id'] ?>, '<?= UOJTime::$time_now_str ?>');
@@ -226,36 +235,20 @@ $('#contest-countdown').countdown(<?= $contest['end_time']->getTimestamp() - UOJ
 <?php endif ?>
 <?php else: ?>
 <h1 class="page-header text-center">#<?= $problem['id']?>. <?= $problem['title'] ?></h1>
-<a role="button" class="btn btn-info pull-right" href="/problem/<?= $problem['id'] ?>/statistics"><span class="glyphicon glyphicon-stats"></span> <?= UOJLocale::get('problems::statistics') ?></a>
+<a role="button" class="btn btn-info float-right" href="/problem/<?= $problem['id'] ?>/statistics"><span class="glyphicon glyphicon-stats"></span> <?= UOJLocale::get('problems::statistics') ?></a>
 <?php endif ?>
-<?php
-    $limit = getUOJConf("/var/uoj_data/{$problem['id']}/problem.conf");
-    $time_limit = $limit['time_limit'];
-    $memory_limit = $limit['memory_limit'];
-?>
-<div class="row text-center">
-    <?php if($time_limit != null ): ?>
-	    <span class="label label-info" style="font-size:15px">Time Limit:&nbsp;<?=$time_limit?> s</span>
-	<?php else: ?>
-	    <span class="label label-info" style="font-size:15px">Time Limit:&nbsp;N/A</span>
-	<?php endif ?>
-    <?php if($memory_limit != null ): ?>
-	    <span class="label label-info" style="font-size:15px">Memory Limit:&nbsp;<?=$memory_limit?> MB</span>
-	<?php else: ?>
-	    <span class="label label-info" style="font-size:15px">Memory Limit:&nbsp;N/A</span>
-	<?php endif ?>
-</div>
+
 <ul class="nav nav-tabs" role="tablist">
-	<li class="active"><a href="#tab-statement" role="tab" data-toggle="tab"><span class="glyphicon glyphicon-book"></span> <?= UOJLocale::get('problems::statement') ?></a></li>
-	<li><a href="#tab-submit-answer" role="tab" data-toggle="tab"><span class="glyphicon glyphicon-upload"></span> <?= UOJLocale::get('problems::submit') ?></a></li>
+	<li class="nav-item"><a class="nav-link active" href="#tab-statement" role="tab" data-toggle="tab"><span class="glyphicon glyphicon-book"></span> <?= UOJLocale::get('problems::statement') ?></a></li>
+	<li class="nav-item"><a class="nav-link" href="#tab-submit-answer" role="tab" data-toggle="tab"><span class="glyphicon glyphicon-upload"></span> <?= UOJLocale::get('problems::submit') ?></a></li>
 	<?php if ($custom_test_requirement): ?>
-	<li><a href="#tab-custom-test" role="tab" data-toggle="tab"><span class="glyphicon glyphicon-console"></span> <?= UOJLocale::get('problems::custom test') ?></a></li>
+	<li class="nav-item"><a class="nav-link" href="#tab-custom-test" role="tab" data-toggle="tab"><span class="glyphicon glyphicon-console"></span> <?= UOJLocale::get('problems::custom test') ?></a></li>
 	<?php endif ?>
 	<?php if (hasProblemPermission($myUser, $problem)): ?>
-	<li><a href="/problem/<?= $problem['id'] ?>/manage/statement" role="tab"><?= UOJLocale::get('problems::manage') ?></a></li>
+	<li class="nav-item"><a class="nav-link" href="/problem/<?= $problem['id'] ?>/manage/statement" role="tab"><?= UOJLocale::get('problems::manage') ?></a></li>
 	<?php endif ?>
 	<?php if ($contest): ?>
-	<li><a href="/contest/<?= $contest['id'] ?>" role="tab"><?= UOJLocale::get('contests::back to the contest') ?></a></li>
+	<li class="nav-item"><a class="nav-link" href="/contest/<?= $contest['id'] ?>" role="tab"><?= UOJLocale::get('contests::back to the contest') ?></a></li>
 	<?php endif ?>
 </ul>
 <div class="tab-content">
diff --git a/web/app/controllers/problem_data_manage.php b/web/app/controllers/problem_data_manage.php
index 4ed4dea..7127d56 100644
--- a/web/app/controllers/problem_data_manage.php
+++ b/web/app/controllers/problem_data_manage.php
@@ -120,7 +120,7 @@
 	$http_host = HTML::escape(UOJContext::httpHost());
 	$download_url = HTML::url("/download.php?type=problem&id={$problem['id']}");
 	$info_form->appendHTML(<<<EOD
-<div class="form-group">
+<div class="form-group row">
 	<!--<label class="col-sm-3 control-label">zip上传数据</label>
 	<div class="col-sm-9">
 		<div class="form-control-static">
@@ -134,7 +134,7 @@
 EOD
 	);
 	$info_form->appendHTML(<<<EOD
-<div class="form-group">
+<div class="form-group row">
 	<label class="col-sm-3 control-label">problem_{$problem['id']}.zip</label>
 	<div class="col-sm-9">
 		<div class="form-control-static">
@@ -145,7 +145,7 @@ EOD
 EOD
 	);
 	$info_form->appendHTML(<<<EOD
-<div class="form-group">
+<div class="form-group row">
 	<label class="col-sm-3 control-label">testlib.h</label>
 	<div class="col-sm-9">
 		<div class="form-control-static">
@@ -158,7 +158,7 @@ EOD
 
 	$esc_submission_requirement = HTML::escape(json_encode(json_decode($problem['submission_requirement']), JSON_PRETTY_PRINT));
 	$info_form->appendHTML(<<<EOD
-<div class="form-group">
+<div class="form-group row">
 	<label class="col-sm-3 control-label">提交文件配置</label>
 	<div class="col-sm-9">
 		<div class="form-control-static"><pre>
@@ -171,7 +171,7 @@ EOD
 	);
 	$esc_extra_config = HTML::escape(json_encode(json_decode($problem['extra_config']), JSON_PRETTY_PRINT));
 	$info_form->appendHTML(<<<EOD
-<div class="form-group">
+<div class="form-group row">
 	<label class="col-sm-3 control-label">其它配置</label>
 	<div class="col-sm-9">
 		<div class="form-control-static"><pre>
@@ -282,12 +282,13 @@ EOD
 		}
 		public function echoDataFilesList($active_file) {
 			foreach ($this->data_files as $file_name) {
+				echo '<li class="nav-item">';
 				if ($file_name != $active_file) {
-					echo '<li>';
+					echo '<a class="nav-link" href="#">';
 				} else {
-					echo '<li class="active">';
+					echo '<a class="nav-link active" href="#">';
 				}
-				echo '<a href="#">', htmlspecialchars($file_name), '</a>', '</li>';
+				echo htmlspecialchars($file_name), '</a>', '</li>';
 			}
 		}
 		public function displayFile($file_name) {
@@ -610,17 +611,17 @@ EOD
 <?php echoUOJPageHeader(HTML::stripTags($problem['title']) . ' - 数据 - 题目管理') ?>
 <h1 class="page-header" align="center">#<?=$problem['id']?> : <?=$problem['title']?> 管理</h1>
 <ul class="nav nav-tabs" role="tablist">
-	<li><a href="/problem/<?= $problem['id'] ?>/manage/statement" role="tab">编辑</a></li>
-	<li><a href="/problem/<?= $problem['id'] ?>/manage/managers" role="tab">管理者</a></li>
-	<li class="active"><a href="/problem/<?= $problem['id'] ?>/manage/data" role="tab">数据</a></li>
-	<li><a href="/problem/<?=$problem['id']?>" role="tab">返回</a></li>
+	<li class="nav-item"><a class="nav-link" href="/problem/<?= $problem['id'] ?>/manage/statement" role="tab">编辑</a></li>
+	<li class="nav-item"><a class="nav-link" href="/problem/<?= $problem['id'] ?>/manage/managers" role="tab">管理者</a></li>
+	<li class="nav-item"><a class="nav-link active" href="/problem/<?= $problem['id'] ?>/manage/data" role="tab">数据</a></li>
+	<li class="nav-item"><a class="nav-link" href="/problem/<?=$problem['id']?>" role="tab">返回</a></li>
 </ul>
 
 <div class="row">
 	<div class="col-md-10 top-buffer-sm">
 		<div class="row">
 			<div class="col-md-3 top-buffer-sm" id="div-file_list">
-				<ul class="nav nav-pills nav-stacked">
+				<ul class="nav nav-pills flex-column">
 					<?php $data_disp->echoDataFilesList('problem.conf'); ?>
 				</ul>
 			</div>
@@ -667,7 +668,7 @@ EOD
 		<?php endif ?>
 		</div>
 		<div class="top-buffer-md">
-			<button id="button-display_view_type" type="button" class="btn btn-primary btn-block" onclick="$('#div-view_type').toggle('fast');">修改提交记录可视权限</button>
+			<button id="button-display_view_type" type="button" class="btn btn-primary btn-block" onclick="$('#div-view_type').toggle('fast');">提交记录可视权限</button>
 			<div class="top-buffer-sm" id="div-view_type" style="display:none; padding-left:5px; padding-right:5px;">
 				<?php $view_type_form->printHTML(); ?>
 			</div>
@@ -697,8 +698,8 @@ EOD
   		<div class="modal-dialog">
     			<div class="modal-content">
       				<div class="modal-header">
+						<h4 class="modal-title" id="myModalLabel">上传数据</h4>
         				<button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
-        				<h4 class="modal-title" id="myModalLabel">上传数据</h4>
       				</div>
       				<div class="modal-body">
         				<form action="" method="post" enctype="multipart/form-data" role="form">
@@ -712,7 +713,7 @@ EOD
       				<div class="modal-footer">
 						<button type="submit" class="btn btn-success">上传</button>
 						</form>
-        				<button type="button" class="btn btn-default" data-dismiss="modal">关闭</button>
+        				<button type="button" class="btn btn-secondary" data-dismiss="modal">关闭</button>
       				</div>
     			</div>
   		</div>
@@ -722,12 +723,12 @@ EOD
   		<div class="modal-dialog">
     			<div class="modal-content">
       				<div class="modal-header">
+						<h4 class="modal-title" id="myModalLabel">试题配置</h4>
         				<button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
-        				<h4 class="modal-title" id="myModalLabel">试题配置</h4>
       				</div>
       				<div class="modal-body">
         				<form class="form-horizontal" action="" method="post" role="form">
-        					<div class="form-group">
+        					<div class="form-group row">
     							<label for="use_builtin_checker" class="col-sm-5 control-label">比对函数</label>
     							<div class="col-sm-7">
 								<select class="form-control" id="use_builtin_checker" name="use_builtin_checker">
@@ -739,55 +740,55 @@ EOD
       								<!--<input type="hidden" class="form-control" id="use_builtin_checker" name="use_builtin_checker" placeholder="比对函数">-->
     							</div>
   							</div>
-  							<div class="form-group">
+  							<div class="form-group row">
     							<label for="n_tests" class="col-sm-5 control-label">n_tests</label>
     							<div class="col-sm-7">
       								<input type="text" class="form-control" id="n_tests" name="n_tests" placeholder="数据点个数">
     							</div>
   							</div>
-  							<div class="form-group">
+  							<div class="form-group row">
     							<label for="n_ex_tests" class="col-sm-5 control-label">n_ex_tests</label>
     							<div class="col-sm-7">
       								<input type="text" class="form-control" id="n_ex_tests" name="n_ex_tests" placeholder="额外数据点个数">
     							</div>
   							</div>
-  							<div class="form-group">
+  							<div class="form-group row">
     							<label for="n_sample_tests" class="col-sm-5 control-label">n_sample_tests</label>
     							<div class="col-sm-7">
       								<input type="text" class="form-control" id="n_sample_tests" name="n_sample_tests" placeholder="样例测试点个数">
     							</div>
   							</div>
-  							<div class="form-group">
+  							<div class="form-group row">
     							<label for="input_pre" class="col-sm-5 control-label">input_pre</label>
     							<div class="col-sm-7">
       								<input type="text" class="form-control" id="input_pre" name="input_pre" placeholder="输入文件名称">
     							</div>
   							</div>
-  							<div class="form-group">
+  							<div class="form-group row">
     							<label for="input_suf" class="col-sm-5 control-label">input_suf</label>
     							<div class="col-sm-7">
       								<input type="text" class="form-control" id="input_suf" name="input_suf" placeholder="输入文件后缀">
     							</div>
   							</div>
-  							<div class="form-group">
+  							<div class="form-group row">
     							<label for="output_pre" class="col-sm-5 control-label">output_pre</label>
     							<div class="col-sm-7">
       								<input type="text" class="form-control" id="output_pre" name="output_pre" placeholder="输出文件名称">
     							</div>
   							</div>
-  							<div class="form-group">
+  							<div class="form-group row">
     							<label for="output_suf" class="col-sm-5 control-label">output_suf</label>
     							<div class="col-sm-7">
       								<input type="text" class="form-control" id="output_suf" name="output_suf" placeholder="输出文件后缀">
     							</div>
   							</div>
-  							<div class="form-group">
+  							<div class="form-group row">
     							<label for="time_limit" class="col-sm-5 control-label">time_limit</label>
     							<div class="col-sm-7">
       								<input type="text" class="form-control" id="time_limit" name="time_limit" placeholder="时间限制（不能为小数！）">
     							</div>
   							</div>
-  							<div class="form-group">
+  							<div class="form-group row">
     							<label for="memory_limit" class="col-sm-5 control-label">memory_limit</label>
     							<div class="col-sm-7">
       								<input type="text" class="form-control" id="memory_limit" name="memory_limit" placeholder="内存限制">
@@ -798,7 +799,7 @@ EOD
       				<div class="modal-footer">
 						<button type="submit" class="btn btn-success">确定</button>
 						</form>
-        				<button type="button" class="btn btn-default" data-dismiss="modal">关闭</button>
+        				<button type="button" class="btn btn-secondary" data-dismiss="modal">关闭</button>
       				</div>
     			</div>
   		</div>
diff --git a/web/app/controllers/problem_managers_manage.php b/web/app/controllers/problem_managers_manage.php
index 415a543..6eb2828 100644
--- a/web/app/controllers/problem_managers_manage.php
+++ b/web/app/controllers/problem_managers_manage.php
@@ -30,10 +30,10 @@
 <?php echoUOJPageHeader(HTML::stripTags($problem['title']) . ' - 管理者 - 题目管理') ?>
 <h1 class="page-header" align="center">#<?=$problem['id']?> : <?=$problem['title']?> 管理</h1>
 <ul class="nav nav-tabs" role="tablist">
-	<li><a href="/problem/<?= $problem['id'] ?>/manage/statement" role="tab">编辑</a></li>
-	<li class="active"><a href="/problem/<?= $problem['id'] ?>/manage/managers" role="tab">管理者</a></li>
-	<li><a href="/problem/<?= $problem['id'] ?>/manage/data" role="tab">数据</a></li>
-	<li><a href="/problem/<?=$problem['id']?>" role="tab">返回</a></li>
+	<li class="nav-item"><a class="nav-link" href="/problem/<?= $problem['id'] ?>/manage/statement" role="tab">编辑</a></li>
+	<li class="nav-item"><a class="nav-link active" href="/problem/<?= $problem['id'] ?>/manage/managers" role="tab">管理者</a></li>
+	<li class="nav-item"><a class="nav-link" href="/problem/<?= $problem['id'] ?>/manage/data" role="tab">数据</a></li>
+	<li class="nav-item"><a class="nav-link" href="/problem/<?=$problem['id']?>" role="tab">返回</a></li>
 </ul>
 
 <table class="table table-hover">
diff --git a/web/app/controllers/problem_set.php b/web/app/controllers/problem_set.php
index 3683ed9..210acbf 100644
--- a/web/app/controllers/problem_set.php
+++ b/web/app/controllers/problem_set.php
@@ -36,7 +36,7 @@
 			echo '<a href="/problem/', $problem['id'], '">', $problem['title'], '</a>';
 			if (isset($_COOKIE['show_tags_mode'])) {
 				foreach (queryProblemTags($problem['id']) as $tag) {
-					echo '<a class="uoj-problem-tag">', '<span class="badge">', HTML::escape($tag), '</span>', '</a>';
+					echo '<a class="uoj-problem-tag">', '<span class="badge badge-pill badge-secondary">', HTML::escape($tag), '</span>', '</a>';
 				}
 			}
 			echo '</td>';
@@ -138,26 +138,12 @@ EOD;
 	<div class="col-sm-4">
 		<?= HTML::tablist($tabs_info, $cur_tab, 'nav-pills') ?>
 	</div>
-	<div class="col-sm-4">
-		<form id="form-search" class="input-group form-group" method="get">
-			<input type="text" class="form-control" name="search" placeholder="<?= UOJLocale::get('search')?>" />  
-			<span class="input-group-btn">
-				<button type="submit" class="btn btn-search btn-primary" id="submit-search"><span class="glyphicon glyphicon-search"></span></button>  
-			</span>
-		</form>
+	<div class="col-sm-4 order-sm-9 checkbox text-right">
+		<label class="checkbox-inline" for="input-show_tags_mode"><input type="checkbox" id="input-show_tags_mode" <?= isset($_COOKIE['show_tags_mode']) ? 'checked="checked" ': ''?>/> <?= UOJLocale::get('problems::show tags') ?></label>
+		<label class="checkbox-inline" for="input-show_submit_mode"><input type="checkbox" id="input-show_submit_mode" <?= isset($_COOKIE['show_submit_mode']) ? 'checked="checked" ': ''?>/> <?= UOJLocale::get('problems::show statistics') ?></label>
 	</div>
-	<div class="col-sm-4 checkbox text-right">
-		<label class="checkbox-inline" for="input-show_tags_mode">
-			<input type="checkbox" id="input-show_tags_mode" <?= isset($_COOKIE['show_tags_mode']) ? 'checked="checked" ': ''?>/> <?= UOJLocale::get('problems::show tags') ?>
-		</label>
-		<label class="checkbox-inline" for="input-show_submit_mode">
-			<input type="checkbox" id="input-show_submit_mode" <?= isset($_COOKIE['show_submit_mode']) ? 'checked="checked" ': ''?>/> <?= UOJLocale::get('problems::show statistics') ?>
-		</label>
-	</div>
-</div>
-<div class="row">
-	<div class="col-xs-10 col-xs-push-1 col-sm-6 col-sm-push-3 input-group">
-		<?php echo $pag->pagination(); ?>
+	<div class="col-sm-4 order-sm-5">
+	<?php echo $pag->pagination(); ?>
 	</div>
 </div>
 <div class="top-buffer-sm"></div>
diff --git a/web/app/controllers/problem_statement_manage.php b/web/app/controllers/problem_statement_manage.php
index 5edde40..37017a5 100644
--- a/web/app/controllers/problem_statement_manage.php
+++ b/web/app/controllers/problem_statement_manage.php
@@ -49,10 +49,10 @@
 <?php echoUOJPageHeader(HTML::stripTags($problem['title']) . ' - 编辑 - 题目管理') ?>
 <h1 class="page-header" align="center">#<?=$problem['id']?> : <?=$problem['title']?> 管理</h1>
 <ul class="nav nav-tabs" role="tablist">
-	<li class="active"><a href="/problem/<?= $problem['id'] ?>/manage/statement" role="tab">编辑</a></li>
-	<li><a href="/problem/<?= $problem['id'] ?>/manage/managers" role="tab">管理者</a></li>
-	<li><a href="/problem/<?= $problem['id'] ?>/manage/data" role="tab">数据</a></li>
-	<li><a href="/problem/<?=$problem['id']?>" role="tab">返回</a></li>
+	<li class="nav-item"><a class="nav-link active" href="/problem/<?= $problem['id'] ?>/manage/statement" role="tab">编辑</a></li>
+	<li class="nav-item"><a class="nav-link" href="/problem/<?= $problem['id'] ?>/manage/managers" role="tab">管理者</a></li>
+	<li class="nav-item"><a class="nav-link" href="/problem/<?= $problem['id'] ?>/manage/data" role="tab">数据</a></li>
+	<li class="nav-item"><a class="nav-link" href="/problem/<?=$problem['id']?>" role="tab">返回</a></li>
 </ul>
 <?php $problem_editor->printHTML() ?>
 <?php echoUOJPageFooter() ?>
diff --git a/web/app/controllers/register.php b/web/app/controllers/register.php
index dc0ac69..cd64bd5 100644
--- a/web/app/controllers/register.php
+++ b/web/app/controllers/register.php
@@ -86,7 +86,7 @@
 	</div>
 	<div class="form-group">
 		<div class="col-sm-offset-2 col-sm-3">
-			<button type="submit" id="button-submit" class="btn btn-default"><?= UOJLocale::get('submit') ?></button>
+			<button type="submit" id="button-submit" class="btn btn-secondary"><?= UOJLocale::get('submit') ?></button>
 		</div>
 	</div>
 </form>
diff --git a/web/app/controllers/reset_pw.php b/web/app/controllers/reset_pw.php
index 093992d..48c79b3 100644
--- a/web/app/controllers/reset_pw.php
+++ b/web/app/controllers/reset_pw.php
@@ -47,7 +47,7 @@
   </div>
   <div class="form-group">
 	<div class="col-sm-offset-2 col-sm-3">
-	  <button type="submit" id="button-submit" class="btn btn-default">提交</button>
+	  <button type="submit" id="button-submit" class="btn btn-secondary">提交</button>
 	</div>
   </div>
 </form>
diff --git a/web/app/controllers/subdomain/blog/archive.php b/web/app/controllers/subdomain/blog/archive.php
index 8b66e0c..593323c 100644
--- a/web/app/controllers/subdomain/blog/archive.php
+++ b/web/app/controllers/subdomain/blog/archive.php
@@ -33,14 +33,14 @@
 <div class="row">
 	<div class="col-md-3">
 		<?php if (UOJContext::hasBlogPermission()): ?>
-		<div class="btn-group btn-group-justified">
+		<div class="btn-group d-flex">
 			<a href="<?=HTML::blog_url(UOJContext::userid(), '/post/new/write')?>" class="btn btn-primary"><span class="glyphicon glyphicon-edit"></span> 写新博客</a>
 			<a href="<?=HTML::blog_url(UOJContext::userid(), '/slide/new/write')?>" class="btn btn-primary"><span class="glyphicon glyphicon-edit"></span> 写新幻灯片</a>
 		</div>
 		<?php endif ?>
-		<div class="panel panel-info top-buffer-sm">
-			<div class="panel-heading">标签</div>
-			<div class="panel-body">
+		<div class="card border-info top-buffer-sm">
+			<div class="card-header bg-info">标签</div>
+			<div class="card-body">
 			<?php if ($all_tags): ?>
 			<?php foreach ($all_tags as $tag): ?>
 				<?php echoBlogTag($tag['tag']) ?>
diff --git a/web/app/controllers/subdomain/blog/blog.php b/web/app/controllers/subdomain/blog/blog.php
index 7a05216..dc32234 100644
--- a/web/app/controllers/subdomain/blog/blog.php
+++ b/web/app/controllers/subdomain/blog/blog.php
@@ -161,8 +161,8 @@
 	?>
 	<div id="comment-<?= $comment['id'] ?>" class="list-group-item">
 		<div class="media">
-			<div class="media-left comtposterbox">
-				<a href="<?= HTML::url('/user/profile/'.$poster['username']) ?>" class="hidden-xs">
+			<div class="media-left comtposterbox mr-3">
+				<a href="<?= HTML::url('/user/profile/'.$poster['username']) ?>" class="d-none d-sm-block">
 					<img class="media-object img-rounded" src="<?= $asrc ?>" alt="avatar" />
 				</a>
 			</div>
@@ -185,7 +185,7 @@
 </div>
 <?= $comments_pag->pagination() ?>
 
-<h3>发表评论</h3>
+<h3 class="mt-4">发表评论</h3>
 <p>可以用@mike来提到mike这个用户，mike会被高亮显示。如果你真的想打“@”这个字符，请用“@@”。</p>
 <?php $comment_form->printHTML() ?>
 
diff --git a/web/app/controllers/submission.php b/web/app/controllers/submission.php
index 91419ef..535e4a8 100644
--- a/web/app/controllers/submission.php
+++ b/web/app/controllers/submission.php
@@ -151,11 +151,11 @@
 <?php endif ?>
 
 <?php if ($should_show_all_details): ?>
-	<div class="panel panel-info">
-		<div class="panel-heading">
-			<h4 class="panel-title"><?= UOJLocale::get('details') ?></h4>
+	<div class="card border-info mb-3">
+		<div class="card-header bg-info">
+			<h4 class="card-title"><?= UOJLocale::get('details') ?></h4>
 		</div>
-		<div class="panel-body">
+		<div class="card-body">
 			<?php echoJudgementDetails($submission_result['details'], $styler, 'details') ?>
 			<?php if ($should_show_details_to_me): ?>
 				<?php if (isset($submission_result['final_result'])): ?>
diff --git a/web/app/controllers/submissions_list.php b/web/app/controllers/submissions_list.php
index 990f4a2..ef93189 100644
--- a/web/app/controllers/submissions_list.php
+++ b/web/app/controllers/submissions_list.php
@@ -31,9 +31,9 @@
 	}
 ?>
 <?php echoUOJPageHeader(UOJLocale::get('submissions')) ?>
-<div class="hidden-xs">
+<div class="d-none d-sm-block">
 	<?php if ($myUser != null): ?>
-	<div class="pull-right">
+	<div class="float-right">
 		<a href="/submissions?submitter=<?= $myUser['username'] ?>" class="btn btn-primary btn-sm"><?= UOJLocale::get('problems::my submissions') ?></a>
 	</div>
 	<?php endif ?>
@@ -56,7 +56,7 @@
 			<label for="input-language" class="control-label"><?= UOJLocale::get('problems::language')?>:</label>
 			<input type="text" class="form-control input-sm" name="language" id="input-language" value="<?= $html_esc_q_language ?>" maxlength="10" style="width:8em" />
 		</div>
-		<button type="submit" id="submit-search" class="btn btn-default btn-sm"><?= UOJLocale::get('search')?></button>
+		<button type="submit" id="submit-search" class="btn btn-secondary btn-sm ml-2"><?= UOJLocale::get('search')?></button>
 	</form>
 	<script type="text/javascript">
 		$('#form-search').submit(function(e) {
diff --git a/web/app/controllers/super_manage.php b/web/app/controllers/super_manage.php
index 7fe0a8e..2ee1bd4 100644
--- a/web/app/controllers/super_manage.php
+++ b/web/app/controllers/super_manage.php
@@ -265,7 +265,7 @@ EOD;
 <?php echoUOJPageHeader('系统管理') ?>
 <div class="row">
 	<div class="col-sm-3">
-		<?= HTML::tablist($tabs_info, $cur_tab, 'nav-pills nav-stacked') ?>
+		<?= HTML::tablist($tabs_info, $cur_tab, 'nav-pills flex-column') ?>
 	</div>
 	
 	<div class="col-sm-9">
diff --git a/web/app/controllers/user_info.php b/web/app/controllers/user_info.php
index d6b2147..f76c236 100644
--- a/web/app/controllers/user_info.php
+++ b/web/app/controllers/user_info.php
@@ -23,16 +23,14 @@
 		}
 		$esc_motto = HTML::escape($user['motto']);
 	?>
-	<div class="panel panel-info">
-		<div class="panel-heading">
-			<h2 class="panel-title"><?= UOJLocale::get('user profile') ?></h2>
-		</div>
-		<div class="panel-body">
-			<div class="row">
-				<div class="col-md-4 col-md-push-8">
-					<img class="media-object img-thumbnail center-block" alt="<?= $user['username'] ?> Avatar" src="<?= HTML::avatar_addr($user, 256) ?>" />
+	<div class="card border-info">
+		<h5 class="card-header bg-info"><?= UOJLocale::get('user profile') ?></h5>
+		<div class="card-body">
+			<div class="row mb-4">
+				<div class="col-md-4 order-md-9">
+					<img class="media-object img-thumbnail d-block mx-auto" alt="<?= $user['username'] ?> Avatar" src="<?= HTML::avatar_addr($user, 256) ?>" />
 				</div>
-				<div class="col-md-8 col-md-pull-4">
+				<div class="col-md-8 order-md-1">
 					<h2><span class="uoj-honor" data-rating="<?= $user['rating'] ?>"><?= $user['username'] ?></span> <span><strong style="<?= $col_sex ?>"><?= $esc_sex ?></strong></span></h2>
 					<div class="list-group">
 						<div class="list-group-item">
@@ -246,9 +244,9 @@ $("#rating-plot").bind("plotclick", function (event, pos, item) {
 </script>
 <?php else: ?>
 	<?php echoUOJPageHeader('不存在该用户' . ' - 用户信息') ?>
-	<div class="panel panel-danger">
-		<div class="panel-heading">用户信息</div>
-		<div class="panel-body">
+	<div class="card border-danger">
+		<div class="card-header bg-danger">用户信息</div>
+		<div class="card-body">
 		<h4>不存在该用户</h4>
 		</div>
 	</div>
diff --git a/web/app/controllers/user_msg.php b/web/app/controllers/user_msg.php
index 4d272d7..bcea8e9 100644
--- a/web/app/controllers/user_msg.php
+++ b/web/app/controllers/user_msg.php
@@ -111,22 +111,22 @@ EOD;
 </div>
 
 <div id="history" style="display:none">
-	<div class="panel panel-primary">
-		<div class="panel-heading">
-			<button type="button" id="goBack" class="btn btn-info btn-xs" style="position:absolute">返回</button>
+	<div class="card border-primary">
+		<div class="card-header bg-primary text-white">
+			<button type="button" id="goBack" class="btn btn-info btn-sm" style="position:absolute">返回</button>
 			<div id="conversation-name" class="text-center"></div>
 		</div>
-		<div class="panel-body">
-			<ul class="pager top-buffer-no">
-				<li class="previous"><a href="#" id="pageLeft">&larr; 更早的消息</a></li>
+		<div class="card-body">
+			<ul class="pagination top-buffer-no justify-content-between">
+				<li class="previous"><a class="btn btn-outline-secondary text-primary" href="#" id="pageLeft">&larr; 更早的消息</a></li>
 				<li class="text-center" id="pageShow" style="line-height:32px"></li>
-				<li class="next"><a href="#" id="pageRight">更新的消息 &rarr;</a></li>
+				<li class="next"><a class="btn btn-outline-secondary text-primary" href="#" id="pageRight">更新的消息 &rarr;</a></li>
 			</ul>
 			<div id="history-list" style="min-height: 200px;">
 			</div>
-			<ul class="pager bot-buffer-no">
-				<li class="previous"><a href="#history" id="pageLeft2">&larr; 更早的消息</a></li>
-				<li class="next"><a href="#history" id="pageRight2">更新的消息 &rarr;</a></li>
+			<ul class="pagination top-buffer-no justify-content-between">
+				<li class="previous"><a class="btn btn-outline-secondary text-primary" href="#history" id="pageLeft2">&larr; 更早的消息</a></li>
+				<li class="next"><a class="btn btn-outline-secondary text-primary" href="#history" id="pageRight2">更新的消息 &rarr;</a></li>
 			</ul>
 			<hr />
 			<form id="form-message">
@@ -172,8 +172,8 @@ function addButton(conversationName, send_time, type) {
 function addBubble(content, send_time, read_time, msgId, conversation, page, type) {
 	$("#history-list").append(
 			'<div style=' + (type ? "margin-left:0%;margin-right:20%;" : "margin-left:20%;margin-right:0%;") + '>' +
-				'<div class="panel panel-info">' +
-					'<div class="panel-body" style="background:#afeeee; word-break: break-all">' +
+				'<div class="card border-info mb-4">' +
+					'<div class="card-body" style="background:#17a2b8; word-break: break-all">' +
 						'<div style="white-space:pre-wrap">' +
 							htmlspecialchars(content) +
 						'</div>' +
diff --git a/web/app/libs/uoj-form-lib.php b/web/app/libs/uoj-form-lib.php
index a1e506e..7a96b5f 100644
--- a/web/app/libs/uoj-form-lib.php
+++ b/web/app/libs/uoj-form-lib.php
@@ -200,7 +200,7 @@ EOD;
 			$default_value = htmlspecialchars($default_value);
 			$this->is_big = true;
 			$html = <<<EOD
-<div id="div-$name">
+<div id="div-$name" class="form-group">
 	<label for="input-$name" class="control-label">$label_text</label>
 	<textarea class="form-control" name="$name" id="input-$name">$default_value</textarea>
 	<span class="help-block" id="help-$name"></span>
@@ -403,7 +403,7 @@ EOD
 					$this->submit_button_config['text'] = UOJLocale::get('submit');
 				}
 				if (!isset($this->submit_button_config['class_str'])) {
-					$this->submit_button_config['class_str'] = 'btn btn-default';
+					$this->submit_button_config['class_str'] = 'btn btn-secondary';
 				}
 				if ($this->submit_button_config['align'] == 'offset') {
 					echo '<div class="form-group">';
@@ -411,7 +411,7 @@ EOD
 				} else {
 					echo '<div class="text-', $this->submit_button_config['align'], '">';
 				}
-				echo '<button type="submit" id="button-submit-', $this->form_name, '" name="submit-', $this->form_name, '" value="', $this->form_name, '" class="', $this->submit_button_config['class_str'], '">', $this->submit_button_config['text'], '</button>';
+				echo '<button type="submit" id="button-submit-', $this->form_name, '" name="submit-', $this->form_name, '" value="', $this->form_name, '" class="mt-2 ', $this->submit_button_config['class_str'], '">', $this->submit_button_config['text'], '</button>';
 				if ($this->submit_button_config['align'] == 'offset') {
 					echo '</div>';
 				}
@@ -732,7 +732,7 @@ EOD;
 	<input type="file" id="input-{$name}" name="{$name}" style="display:none;" onchange="$('#input-{$name}_path').val($('#input-{$name}').val());" />
 	<div class="input-group bot-buffer-md">
 		<input id="input-{$name}_path" class="form-control" type="text" readonly="readonly" />
-		<span class="input-group-btn">
+		<span class="input-group-append">
 			<button type="button" class="btn btn-primary" style="width:100px; !important" onclick="$('#input-{$name}').click();"><span class="glyphicon glyphicon-folder-open"></span> $browse_text</button>
 		</span>
 	</div>
diff --git a/web/app/libs/uoj-html-lib.php b/web/app/libs/uoj-html-lib.php
index 8bab6bf..db641c6 100644
--- a/web/app/libs/uoj-html-lib.php
+++ b/web/app/libs/uoj-html-lib.php
@@ -420,14 +420,14 @@ function echoSubmissionContent($submission, $requirement) {
 					$sh_class = '';
 					break;
 			}
-			echo '<div class="panel panel-info">';
-			echo '<div class="panel-heading">';
-			echo '<h4 class="panel-title">'.$req['name'].'</h4>';
+			echo '<div class="card border-info mb-3">';
+			echo '<div class="card-header bg-info">';
+			echo '<h4 class="card-title">'.$req['name'].'</h4>';
 			echo '</div>';
-			echo '<div class="panel-body">';
+			echo '<div class="card-body">';
 			echo '<pre><code class="'.$sh_class.'">'.$file_content."\n".'</code></pre>';
 			echo '</div>';
-			echo '<div class="panel-footer">'.$footer_text.'</div>';
+			echo '<div class="card-footer">'.$footer_text.'</div>';
 			echo '</div>';
 		}
 		else if ($req['type'] == "text") {
@@ -435,14 +435,14 @@ function echoSubmissionContent($submission, $requirement) {
 			$file_content = strOmit($file_content, 500);
 			$file_content = uojTextEncode($file_content, array('allow_CR' => true, 'html_escape' => true));
 			$footer_text = UOJLocale::get('problems::text file');
-			echo '<div class="panel panel-info">';
-			echo '<div class="panel-heading">';
-			echo '<h4 class="panel-title">'.$req['file_name'].'</h4>';
+			echo '<div class="card border-info mb-3">';
+			echo '<div class="card-header bg-info">';
+			echo '<h4 class="card-title">'.$req['file_name'].'</h4>';
 			echo '</div>';
-			echo '<div class="panel-body">';
+			echo '<div class="card-body">';
 			echo '<pre>'."\n".$file_content."\n".'</pre>';
 			echo '</div>';
-			echo '<div class="panel-footer">'.$footer_text.'</div>';
+			echo '<div class="card-footer">'.$footer_text.'</div>';
 			echo '</div>';
 		}
 	}
@@ -473,7 +473,7 @@ class JudgementDetailsPrinter {
 			$this->_print_c($node);
 			echo "\n</pre>";
 		} elseif ($node->nodeName == 'tests') {
-			echo '<div class="panel-group" id="', $this->name, '_details_accordion">';
+			echo '<div id="', $this->name, '_details_accordion">';
 			if ($this->styler->show_small_tip) {
 				echo '<div class="text-right text-muted">', '小提示：点击横条可展开更详细的信息', '</div>';
 			}
@@ -487,16 +487,16 @@ class JudgementDetailsPrinter {
 			$subtask_score = $node->getAttribute('score');
 			$subtask_info = $node->getAttribute('info');
 			
-			echo '<div class="panel ', $this->styler->getTestInfoClass($subtask_info), '">';
+			echo '<div class="card ', $this->styler->getTestInfoClass($subtask_info), ' mb-3">';
 			
 			$accordion_parent = "{$this->name}_details_accordion";
 			$accordion_collapse =  "{$accordion_parent}_collapse_subtask_{$subtask_num}";
 			$accordion_collapse_accordion =  "{$accordion_collapse}_accordion";
-			echo 	'<div class="panel-heading" data-toggle="collapse" data-parent="#', $accordion_parent, '" data-target="#', $accordion_collapse, '">';
+			echo 	'<div class="card-header" data-toggle="collapse" data-parent="#', $accordion_parent, '" data-target="#', $accordion_collapse, '">';
 			
 			echo 		'<div class="row">';
 			echo 			'<div class="col-sm-2">';
-			echo 				'<h3 class="panel-title">', 'Subtask #', $subtask_num, ': ', '</h3>';
+			echo 				'<h3 class="card-title">', 'Subtask #', $subtask_num, ': ', '</h3>';
 			echo 			'</div>';
 			
 			if ($this->styler->show_score) {
@@ -515,10 +515,10 @@ class JudgementDetailsPrinter {
 			echo 		'</div>';
 			echo 	'</div>';
 			
-			echo 	'<div id="', $accordion_collapse, '" class="panel-collapse collapse">';
-			echo 		'<div class="panel-body">';
+			echo 	'<div id="', $accordion_collapse, '" class="card-collapse collapse">';
+			echo 		'<div class="card-body">';
 
-			echo 			'<div id="', $accordion_collapse_accordion, '" class="panel-group">';
+			echo 			'<div id="', $accordion_collapse_accordion, '">';
 			$this->subtask_num = $subtask_num;
 			$this->_print_c($node);
 			$this->subtask_num = null;
@@ -534,7 +534,7 @@ class JudgementDetailsPrinter {
 			$test_time = $node->getAttribute('time');
 			$test_memory = $node->getAttribute('memory');
 
-			echo '<div class="panel ', $this->styler->getTestInfoClass($test_info), '">';
+			echo '<div class="card ', $this->styler->getTestInfoClass($test_info), ' mb-3">';
 			
 			$accordion_parent = "{$this->name}_details_accordion";
 			if ($this->subtask_num != null) {
@@ -542,16 +542,16 @@ class JudgementDetailsPrinter {
 			}
 			$accordion_collapse = "{$accordion_parent}_collapse_test_{$test_num}";
 			if (!$this->styler->shouldFadeDetails($test_info)) {
-				echo '<div class="panel-heading" data-toggle="collapse" data-parent="#', $accordion_parent, '" data-target="#', $accordion_collapse, '">';
+				echo '<div class="card-header" data-toggle="collapse" data-parent="#', $accordion_parent, '" data-target="#', $accordion_collapse, '">';
 			} else {
-				echo '<div class="panel-heading">';
+				echo '<div class="card-header">';
 			}
 			echo '<div class="row">';
 			echo '<div class="col-sm-2">';
 			if ($test_num > 0) {
-				echo '<h4 class="panel-title">', 'Test #', $test_num, ': ', '</h4>';
+				echo '<h4 class="card-title">', 'Test #', $test_num, ': ', '</h4>';
 			} else {
-				echo '<h4 class="panel-title">', 'Extra Test:', '</h4>';
+				echo '<h4 class="card-title">', 'Extra Test:', '</h4>';
 			}
 			echo '</div>';
 				
@@ -584,12 +584,12 @@ class JudgementDetailsPrinter {
 			echo '</div>';
 
 			if (!$this->styler->shouldFadeDetails($test_info)) {
-				$accordion_collapse_class = 'panel-collapse collapse';
+				$accordion_collapse_class = 'card-collapse collapse';
 				if ($this->styler->collapse_in) {
 					$accordion_collapse_class .= ' in';
 				}
 				echo '<div id="', $accordion_collapse, '" class="', $accordion_collapse_class, '">';
-				echo '<div class="panel-body">';
+				echo '<div class="card-body">';
 
 				$this->_print_c($node);
 
@@ -603,18 +603,18 @@ class JudgementDetailsPrinter {
 			$test_time = $node->getAttribute('time');
 			$test_memory = $node->getAttribute('memory');
 
-			echo '<div class="panel ', $this->styler->getTestInfoClass($test_info), '">';
+			echo '<div class="card ', $this->styler->getTestInfoClass($test_info), ' mb-3">';
 			
 			$accordion_parent = "{$this->name}_details_accordion";
 			$accordion_collapse = "{$accordion_parent}_collapse_custom_test";
 			if (!$this->styler->shouldFadeDetails($test_info)) {
-				echo '<div class="panel-heading" data-toggle="collapse" data-parent="#', $accordion_parent, '" data-target="#', $accordion_collapse, '">';
+				echo '<div class="card-header" data-toggle="collapse" data-parent="#', $accordion_parent, '" data-target="#', $accordion_collapse, '">';
 			} else {
-				echo '<div class="panel-heading">';
+				echo '<div class="card-header">';
 			}
 			echo '<div class="row">';
 			echo '<div class="col-sm-2">';
-			echo '<h4 class="panel-title">', 'Custom Test: ', '</h4>';
+			echo '<h4 class="card-title">', 'Custom Test: ', '</h4>';
 			echo '</div>';
 				
 			echo '<div class="col-sm-4">';
@@ -637,12 +637,12 @@ class JudgementDetailsPrinter {
 			echo '</div>';
 
 			if (!$this->styler->shouldFadeDetails($test_info)) {
-				$accordion_collapse_class = 'panel-collapse collapse';
+				$accordion_collapse_class = 'card-collapse collapse';
 				if ($this->styler->collapse_in) {
 					$accordion_collapse_class .= ' in';
 				}
 				echo '<div id="', $accordion_collapse, '" class="', $accordion_collapse_class, '">';
-				echo '<div class="panel-body">';
+				echo '<div class="card-body">';
 
 				$this->_print_c($node);
 
@@ -706,13 +706,13 @@ class SubmissionDetailsStyler {
 	public $fade_all_details = false;
 	public function getTestInfoClass($info) {
 		if ($info == 'Accepted' || $info == 'Extra Test Passed') {
-			return 'panel-uoj-accepted';
+			return 'card-uoj-accepted';
 		} elseif ($info == 'Time Limit Exceeded') {
-			return 'panel-uoj-tle';
+			return 'card-uoj-tle';
 		} elseif ($info == 'Acceptable Answer') {
-			return 'panel-uoj-acceptable-answer';
+			return 'card-uoj-acceptable-answer';
 		} else {
-			return 'panel-uoj-wrong';
+			return 'card-uoj-wrong';
 		}
 	}
 	public function shouldFadeDetails($info) {
@@ -727,13 +727,13 @@ class CustomTestSubmissionDetailsStyler {
 	public $ioi_contest_is_running = false;
 	public function getTestInfoClass($info) {
 		if ($info == 'Success') {
-			return 'panel-uoj-accepted';
+			return 'card-uoj-accepted';
 		} elseif ($info == 'Time Limit Exceeded') {
-			return 'panel-uoj-tle';
+			return 'card-uoj-tle';
 		} elseif ($info == 'Acceptable Answer') {
-			return 'panel-uoj-acceptable-answer';
+			return 'card-uoj-acceptable-answer';
 		} else {
-			return 'panel-uoj-wrong';
+			return 'card-uoj-wrong';
 		}
 	}
 	public function shouldFadeDetails($info) {
@@ -747,13 +747,13 @@ class HackDetailsStyler {
 	public $fade_all_details = false;
 	public function getTestInfoClass($info) {
 		if ($info == 'Accepted' || $info == 'Extra Test Passed') {
-			return 'panel-uoj-accepted';
+			return 'card-uoj-accepted';
 		} elseif ($info == 'Time Limit Exceeded') {
-			return 'panel-uoj-tle';
+			return 'card-uoj-tle';
 		} elseif ($info == 'Acceptable Answer') {
-			return 'panel-uoj-acceptable-answer';
+			return 'card-uoj-acceptable-answer';
 		} else {
-			return 'panel-uoj-wrong';
+			return 'card-uoj-wrong';
 		}
 	}
 	public function shouldFadeDetails($info) {
@@ -910,7 +910,7 @@ function echoBlog($blog, $config = array()) {
 	uojIncludeView('blog-preview', $config);
 }
 function echoBlogTag($tag) {
-	echo '<a class="uoj-blog-tag"><span class="badge">', HTML::escape($tag), '</span></a>';
+	echo '<a class="uoj-blog-tag"><span class="badge badge-pill badge-secondary">', HTML::escape($tag), '</span></a>';
 }
 
 function echoUOJPageHeader($page_title, $extra_config = array()) {
diff --git a/web/app/locale/basic/en.php b/web/app/locale/basic/en.php
index 51adc40..70d81f3 100644
--- a/web/app/locale/basic/en.php
+++ b/web/app/locale/basic/en.php
@@ -1,5 +1,6 @@
 <?php
 return [
+	'_common_name' => 'English',
 	'login' => 'Login',
 	'register' => 'Register',
 	'logout' => 'Logout',
diff --git a/web/app/locale/basic/zh-cn.php b/web/app/locale/basic/zh-cn.php
index 7ec6638..1e138da 100644
--- a/web/app/locale/basic/zh-cn.php
+++ b/web/app/locale/basic/zh-cn.php
@@ -1,5 +1,6 @@
 <?php
 return [
+	'_common_name' => '中文',
 	'login' => '登录',
 	'register' => '注册',
 	'logout' => '登出',
diff --git a/web/app/models/HTML.php b/web/app/models/HTML.php
index 848c245..215faa1 100644
--- a/web/app/models/HTML.php
+++ b/web/app/models/HTML.php
@@ -14,7 +14,7 @@ class HTML {
 	public static function tablist($tabs_info, $cur, $type = 'nav-tabs') {
 		$html = '<ul class="nav '.$type.'" role="tablist">';
 		foreach ($tabs_info as $id => $tab) {
-			$html .= '<li'.($cur == $id ? ' class="active"' : '').'><a href="'.$tab['url'].'" role="tab">'.$tab['name'].'</a></li>';
+			$html .= '<li class="nav-item"><a class="nav-link'.($cur == $id ? ' active' : '').'" href="'.$tab['url'].'" role="tab">'.$tab['name'].'</a></li>';
 		}
 		$html .= '</ul>';
 		return $html;
diff --git a/web/app/models/Paginator.php b/web/app/models/Paginator.php
index d18209c..85a4cca 100644
--- a/web/app/models/Paginator.php
+++ b/web/app/models/Paginator.php
@@ -74,28 +74,26 @@ class Paginator {
 		if ($this->n_pages == 1) {
 			return '';
 		}
-		$html = '<div class="text-center">';
-		$html .= '<ul class="pagination top-buffer-no bot-buffer-sm">';
+		$html = '<ul class="pagination top-buffer-no bot-buffer-sm justify-content-center">';
 		if ($this->cur_page > 1) {
-			$html .= '<li><a href="'.$this->getPageUri($this->cur_page - 1).'"><span class="glyphicon glyphicon glyphicon-backward"></span></a></li>';
+			$html .= '<li class="page-item"><a class="page-link" href="'.$this->getPageUri($this->cur_page - 1).'"><span class="glyphicon glyphicon glyphicon-backward"></span></a></li>';
 		} else {
-			$html .= '<li class="disabled"><a><span class="glyphicon glyphicon glyphicon-backward"></span></a></li>';
+			$html .= '<li class="page-item disabled"><a class="page-link"><span class="glyphicon glyphicon glyphicon-backward"></span></a></li>';
 		}
 			
 		for ($i = max($this->cur_page - $this->max_extend, 1); $i <= min($this->cur_page + $this->max_extend, $this->n_pages); $i++) {
 			if ($i == $this->cur_page) {
-				$html .= '<li class="active"><a href="'.$this->getPageUri($i).'">'.$i.'</a></li>';
+				$html .= '<li class="page-item active"><a class="page-link" href="'.$this->getPageUri($i).'">'.$i.'</a></li>';
 			} else {
-				$html .= '<li><a href="'.$this->getPageUri($i).'">'.$i.'</a></li>';
+				$html .= '<li class="page-item"><a class="page-link" href="'.$this->getPageUri($i).'">'.$i.'</a></li>';
 			}
 		}
 		if ($this->cur_page < $this->n_pages) {
-			$html .= '<li><a href="'.$this->getPageUri($this->cur_page + 1).'"><span class="glyphicon glyphicon glyphicon-forward"></span></a></li>';
+			$html .= '<li class="page-item"><a class="page-link" href="'.$this->getPageUri($this->cur_page + 1).'"><span class="glyphicon glyphicon glyphicon-forward"></span></a></li>';
 		} else {
-			$html .= '<li class="disabled"><a><span class="glyphicon glyphicon glyphicon-forward"></span></a></li>';
+			$html .= '<li class="page-item disabled"><a class="page-link"><span class="glyphicon glyphicon glyphicon-forward"></span></a></li>';
 		}
 		$html .= '</ul>';
-		$html .= '</div>';
 		return $html;
 	}
 }
diff --git a/web/app/views/blog-editor.php b/web/app/views/blog-editor.php
index 79e34ed..04f8b1b 100644
--- a/web/app/views/blog-editor.php
+++ b/web/app/views/blog-editor.php
@@ -9,7 +9,7 @@
 	</div>
 </div>
 <?= HTML::div_vtextarea("{$editor->name}_content_md", $editor->label_text['content'], $editor->cur_data['content_md']) ?>
-<div class="row">
+<div class="row mt-2">
 	<div class="col-sm-6">
 		<?php if ($editor->blog_url): ?>
 		<a id="a-<?= $editor->name ?>_view_blog" class="btn btn-info" href="<?= HTML::escape($editor->blog_url) ?>"><?= $editor->label_text['view blog'] ?></a>
diff --git a/web/app/views/blog-nav.php b/web/app/views/blog-nav.php
index 4a5a610..c2edb9f 100644
--- a/web/app/views/blog-nav.php
+++ b/web/app/views/blog-nav.php
@@ -1,22 +1,16 @@
-<div class="navbar navbar-default" role="navigation">
-	<div class="container-fluid">
-		<div class="navbar-header">
-			<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target=".navbar-collapse">
-				<span class="sr-only">导航</span>
-				<span class="icon-bar"></span>
-				<span class="icon-bar"></span>
-				<span class="icon-bar"></span>
-			</button>
-			<a class="navbar-brand" href="<?= HTML::blog_url(UOJContext::userid(), '/')?>"><?= UOJContext::userid() ?></a>
-		</div>
-		<div class="navbar-collapse collapse">
-			<ul class="nav navbar-nav">
-				<li><a href="<?= HTML::blog_url(UOJContext::userid(), '/archive')?>">日志</a></li>
-				<li><a href="<?= HTML::blog_url(UOJContext::userid(), '/aboutme')?>">关于我</a></li>
-				<li><a href="<?= HTML::url('/') ?>"><?= UOJConfig::$data['profile']['oj-name-short'] ?></a></li>
-			</ul>
-		</div><!--/.nav-collapse -->
-	</div>
+<div class="navbar navbar-light navbar-expand-md bg-light mb-4" role="navigation">
+	<a class="navbar-brand" href="<?= HTML::blog_url(UOJContext::userid(), '/')?>"><?= UOJContext::userid() ?></a>
+	<button type="button" class="navbar-toggler collapsed" data-toggle="collapse" data-target=".navbar-collapse">
+		<span class="sr-only">导航</span>
+		<span class="navbar-toggler-icon"></span>
+	</button>
+	<div class="navbar-collapse collapse">
+		<ul class="nav navbar-nav">
+			<li class="nav-item"><a class="nav-link" href="<?= HTML::blog_url(UOJContext::userid(), '/archive')?>"><span class="glyphicon glyphicon-inbox"></span> 日志</a></li>
+			<li class="nav-item"><a class="nav-link" href="<?= HTML::blog_url(UOJContext::userid(), '/aboutme')?>"><span class="glyphicon glyphicon-user"></span> 关于我</a></li>
+			<li class="nav-item"><a class="nav-link" href="<?= HTML::url('/') ?>"><span class="glyphicon glyphicon-link"></span> <?= UOJConfig::$data['profile']['oj-name-short'] ?></a></li>
+		</ul>
+	</div><!--/.nav-collapse -->
 </div>
 <script type="text/javascript">
 	var uojBlogUrl = '<?= HTML::blog_url(UOJContext::userid(), '')?>';
diff --git a/web/app/views/blog-preview.php b/web/app/views/blog-preview.php
index 0005aca..271a739 100644
--- a/web/app/views/blog-preview.php
+++ b/web/app/views/blog-preview.php
@@ -17,8 +17,8 @@
 <h2><?= $extra_text ?><a class="header-a" href="<?= HTML::blog_url(UOJContext::userid(), '/post/'.$blog['id']) ?>"><?= $blog['title'] ?></a></h2>
 <div><?= $blog['post_time'] ?> <strong>By</strong> <?= getUserLink($blog['poster']) ?></div>
 <?php if (!$show_title_only): ?>
-<div class="panel panel-default">
-	<div class="panel-body">
+<div class="card mb-4">
+	<div class="card-body">
 		<?php if ($blog_type == 'post'): ?>
 		<article><?= $content ?></article>
 		<?php elseif ($blog_type == 'slide'): ?>
@@ -27,26 +27,26 @@
 				<iframe class="embed-responsive-item" src="<?= HTML::blog_url(UOJContext::userid(), '/slide/'.$blog['id']) ?>"></iframe>
 			</div>
 			<div class="text-right top-buffer-sm">
-				<a class="btn btn-default btn-md" href="<?= HTML::blog_url(UOJContext::userid(), '/slide/'.$blog['id']) ?>"><span class="glyphicon glyphicon-fullscreen"></span> 全屏</a>
+				<a class="btn btn-secondary btn-md" href="<?= HTML::blog_url(UOJContext::userid(), '/slide/'.$blog['id']) ?>"><span class="glyphicon glyphicon-fullscreen"></span> 全屏</a>
 			</div>
 		</article>
 		<?php endif ?>
 	</div>
-	<div class="panel-footer text-right">
+	<div class="card-footer text-right">
 		<ul class="list-inline bot-buffer-no">
-			<li>
+			<li class="list-inline-item">
 			<?php foreach (queryBlogTags($blog['id']) as $tag): ?>
 				<?php echoBlogTag($tag) ?>
 			<?php endforeach ?>
 			</li>
 			<?php if ($is_preview): ?>
-  			<li><a href="<?= HTML::blog_url(UOJContext::userid(), '/post/'.$blog['id']) ?>">阅读全文</a></li>
+  			<li class="list-inline-item"><a href="<?= HTML::blog_url(UOJContext::userid(), '/post/'.$blog['id']) ?>">阅读全文</a></li>
   			<?php endif ?>
   			<?php if (Auth::check() && (isSuperUser(Auth::user()) || Auth::id() == $blog['poster'])): ?>
-			<li><a href="<?=HTML::blog_url(UOJContext::userid(), '/'.$blog_type.'/'.$blog['id'].'/write')?>">修改</a></li>
-			<li><a href="<?=HTML::blog_url(UOJContext::userid(), '/post/'.$blog['id'].'/delete')?>">删除</a></li>
+			<li class="list-inline-item"><a href="<?=HTML::blog_url(UOJContext::userid(), '/'.$blog_type.'/'.$blog['id'].'/write')?>">修改</a></li>
+			<li class="list-inline-item"><a href="<?=HTML::blog_url(UOJContext::userid(), '/post/'.$blog['id'].'/delete')?>">删除</a></li>
 			<?php endif ?>
-  			<li><?= getClickZanBlock('B', $blog['id'], $blog['zan']) ?></li>
+  			<li class="list-inline-item"><?= getClickZanBlock('B', $blog['id'], $blog['zan']) ?></li>
 		</ul>
 	</div>
 </div>
diff --git a/web/app/views/contest-backstage.php b/web/app/views/contest-backstage.php
index c097070..494866d 100644
--- a/web/app/views/contest-backstage.php
+++ b/web/app/views/contest-backstage.php
@@ -1,11 +1,11 @@
 
-<ul class="nav nav-tabs" role="tablist">
-	<li class="active"><a href="#tab-question" role="tab" data-toggle="tab">提问</a></li>
+<ul class="nav nav-pills float-right" role="tablist">
+	<li class="nav-item"><a class="nav-link active" href="#tab-question" role="tab" data-toggle="tab">提问</a></li>
 	<?php if ($post_notice): ?>
-		<li><a href="#tab-notice" role="tab" data-toggle="tab">公告</a></li>
+		<li class="nav-item"><a class="nav-link" href="#tab-notice" role="tab" data-toggle="tab">公告</a></li>
 	<?php endif ?>
 	<?php if ($standings_data): ?>
-		<li><a href="#tab-standings" role="tab" data-toggle="tab">终榜</a></li>
+		<li class="nav-item"><a class="nav-link" href="#tab-standings" role="tab" data-toggle="tab">终榜</a></li>
 	<?php endif ?>
 </ul>
 <div class="tab-content">
diff --git a/web/app/views/contest-dashboard.php b/web/app/views/contest-dashboard.php
index cd383d4..fbf0e7f 100644
--- a/web/app/views/contest-dashboard.php
+++ b/web/app/views/contest-dashboard.php
@@ -66,7 +66,7 @@
 <?php if ($my_questions_pag != null): ?>
 	<div>
 		<?php if ($post_question): ?>
-			<div class="pull-right">
+			<div class="float-right">
 				<button id="button-display-post-question" type="button" class="btn btn-primary btn-xs">提问题</button>
 			</div>
 		<?php endif ?>
diff --git a/web/app/views/main-nav.php b/web/app/views/main-nav.php
index 110458c..62952e9 100644
--- a/web/app/views/main-nav.php
+++ b/web/app/views/main-nav.php
@@ -1,25 +1,42 @@
-<div class="navbar navbar-default" role="navigation">
-	<div class="container-fluid">
-		<div class="navbar-header">
-			<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target=".navbar-collapse">
-				<span class="icon-bar"></span>
-				<span class="icon-bar"></span>
-				<span class="icon-bar"></span>
-			</button>
-			<a class="navbar-brand" href="<?= HTML::url('/') ?>"><?= UOJConfig::$data['profile']['oj-name-short'] ?></a>
-		</div>
-		<div class="navbar-collapse collapse">
-			<ul class="nav navbar-nav">
-				<li><a href="<?= HTML::url('/contests') ?>"><?= UOJLocale::get('contests') ?></a></li>
-				<li><a href="<?= HTML::url('/problems') ?>"><?= UOJLocale::get('problems') ?></a></li>
-				<li><a href="<?= HTML::url('/submissions') ?>"><?= UOJLocale::get('submissions') ?></a></li>
-				<li><a href="<?= HTML::url('/hacks') ?>"><?= UOJLocale::get('hacks') ?></a></li>
-				<li><a href="<?= HTML::blog_list_url() ?>"><?= UOJLocale::get('blogs') ?></a></li>
-				<li><a href="<?= HTML::url('/faq') ?>"><?= UOJLocale::get('help') ?></a></li>
-			</ul>
-		</div><!--/.nav-collapse -->
-	</div>
+<div class="navbar navbar-light navbar-expand-md bg-light mb-4" role="navigation">
+	<a class="navbar-brand" href="<?= HTML::url('/') ?>"><?= UOJConfig::$data['profile']['oj-name-short'] ?></a>
+	<button type="button" class="navbar-toggler collapsed" data-toggle="collapse" data-target=".navbar-collapse">
+		<span class="navbar-toggler-icon"></span>
+	</button>
+	<div class="collapse navbar-collapse" id="navbarSupportedContent">
+		<ul class="nav navbar-nav mr-auto">
+			<li class="nav-item"><a class="nav-link" href="<?= HTML::url('/contests') ?>"><span class="glyphicon glyphicon-stats"></span> <?= UOJLocale::get('contests') ?></a></li>
+			<li class="nav-item"><a class="nav-link" href="<?= HTML::url('/problems') ?>"><span class="glyphicon glyphicon-list-alt"></span> <?= UOJLocale::get('problems') ?></a></li>
+			<li class="nav-item"><a class="nav-link" href="<?= HTML::url('/submissions') ?>"><span class="glyphicon glyphicon-tasks"></span> <?= UOJLocale::get('submissions') ?></a></li>
+			<li class="nav-item"><a class="nav-link" href="<?= HTML::url('/hacks') ?>"><span class="glyphicon glyphicon-flag"></span> <?= UOJLocale::get('hacks') ?></a></li>
+			<li class="nav-item"><a class="nav-link" href="<?= HTML::blog_list_url() ?>"><span class="glyphicon glyphicon-edit"></span> <?= UOJLocale::get('blogs') ?></a></li>
+			<li class="nav-item"><a class="nav-link" href="<?= HTML::url('/faq') ?>"><span class="glyphicon glyphicon-info-sign"></span> <?= UOJLocale::get('help') ?></a></li>
+		</ul>
+		<form id="form-search-problem" class="form-inline my-2 my-lg-0" method="get">
+			 <div class="input-group">
+				<input type="text" class="form-control" name="search" id="input-search" placeholder="<?= UOJLocale::get('search')?>" />  
+				<div class="input-group-append">
+					<button type="submit" class="btn btn-search btn-outline-primary" id="submit-search"><span class="glyphicon glyphicon-search"></span></button>
+				</div>
+			</div>
+		</form>
+	</div><!--/.nav-collapse -->
 </div>
 <script type="text/javascript">
 	var zan_link = '';
+	$('#form-search-problem').submit(function(e) {
+		e.preventDefault();
+		
+		url = '<?= HTML::url('/problems') ?>';
+		qs = [];
+		$(['search']).each(function () {
+			if ($('#input-' + this).val()) {
+				qs.push(this + '=' + encodeURIComponent($('#input-' + this).val()));
+			}
+		});
+		if (qs.length > 0) {
+			url += '?' + qs.join('&');
+		}
+		location.href = url;
+	});
 </script>
\ No newline at end of file
diff --git a/web/app/views/page-footer.php b/web/app/views/page-footer.php
index b588d7b..bc707be 100644
--- a/web/app/views/page-footer.php
+++ b/web/app/views/page-footer.php
@@ -6,18 +6,20 @@
 			</div>
 			<?php if ($ShowPageFooter): ?>
 			<div class="uoj-footer">
-				<p>
-					<a href="<?= HTML::url(UOJContext::requestURI(), array('params' => array('locale' => 'zh-cn'))) ?>"><img src="/pictures/lang/cn.png" alt="中文" /></a> 
-					<a href="<?= HTML::url(UOJContext::requestURI(), array('params' => array('locale' => 'en'))) ?>"><img src="/pictures/lang/gb.png" alt="English" /></a>
-				</p>
-				
-				<ul class="list-inline">
-					<li><?= UOJConfig::$data['profile']['oj-name'] ?></li>
-					<?php if (UOJConfig::$data['profile']['ICP-license'] != ''): ?> | 
-					<li><a href="http://www.miitbeian.gov.cn" target="_blank"><?= UOJConfig::$data['profile']['ICP-license'] ?></a></li>
-					<?php endif ?>
-				</ul>
+				<div class="btn-group dropright mb-3">
+					<button type="button" class="btn btn-sm btn-outline-secondary dropdown-toggle" data-toggle="dropdown">
+						<span class="glyphicon glyphicon-globe"></span> <?= UOJLocale::get('_common_name') ?>
+					</button>
+					<div class="dropdown-menu">
+						<a class="dropdown-item" href="<?= HTML::url(UOJContext::requestURI(), array('params' => array('locale' => 'zh-cn'))) ?>">中文</a>
+						<a class="dropdown-item" href="<?= HTML::url(UOJContext::requestURI(), array('params' => array('locale' => 'en'))) ?>">English</a>
+					</div>
+				</div>
 				
+				<ul class="list-inline"><li class="list-inline-item"><?= UOJConfig::$data['profile']['oj-name'] ?></li></ul>
+				<?php if (UOJConfig::$data['profile']['ICP-license'] != '' && preg_match_all('/(\d+\.?\d+)/', UOJConfig::$data['profile']['ICP-license'], $ICP_number)): ?>
+				<p><a target="_blank" href="http://www.beian.gov.cn/portal/registerSystemInfo?recordcode=<?= $ICP_number[0][0] ?>" style="text-decoration:none;"><img src="http://uoj.ac/pictures/beian.png" /> <?= UOJConfig::$data['profile']['ICP-license'] ?></a></p>
+				<?php endif ?>
 				<p><?= UOJLocale::get('server time') ?>: <?= UOJTime::$time_now_str ?> | <a href="https://github.com/UniversalOJ/UOJ-System" target="_blank"><?= UOJLocale::get('opensource project') ?></a></p>
 			</div>
 			<?php endif ?>
diff --git a/web/app/views/page-header.php b/web/app/views/page-header.php
index c984781..23cbcaa 100644
--- a/web/app/views/page-header.php
+++ b/web/app/views/page-header.php
@@ -6,17 +6,17 @@
 	if ($new_user_msg_num == 0) {
 		$new_user_msg_num_html = '';
 	} else {
-		$new_user_msg_num_html = '<span class="badge">'.$new_user_msg_num.'</span>';
+		$new_user_msg_num_html = '<span class="badge badge-pill badge-secondary">'.$new_user_msg_num.'</span>';
 	}
 	if ($new_system_msg_num == 0) {
 		$new_system_msg_num_html = '';
 	} else {
-		$new_system_msg_num_html = '<span class="badge">'.$new_system_msg_num.'</span>';
+		$new_system_msg_num_html = '<span class="badge badge-pill badge-secondary">'.$new_system_msg_num.'</span>';
 	}
 	if ($new_msg_tot == 0) {
 		$new_msg_tot_html = '';
 	} else {
-		$new_msg_tot_html = '<sup><span class="badge">'.$new_msg_tot.'</span></sup>';
+		$new_msg_tot_html = '<sup><span class="badge badge-pill badge-secondary">'.$new_msg_tot.'</span></sup>';
 	}
 	
 	if (!isset($PageMainTitle)) {
@@ -42,9 +42,9 @@
 		<script type="text/javascript">uojHome = '<?= HTML::url('/') ?>'</script>
 
 		<!-- Bootstrap core CSS -->
-		<?= HTML::css_link('/css/bootstrap.min.css?v=2015.5.31') ?>
-		<!-- Bootstrap theme -->
-		<?= HTML::css_link('/css/bootstrap-theme.min.css?v=2015.5.31') ?>
+		<?= HTML::css_link('/css/bootstrap.min.css?v=2019.5.31') ?>
+		<!-- Bootstrap Glyphicons CSS-->
+		<?= HTML::css_link('/css/bootstrap-glyphicons.min.css?v=2019.5.31') ?>
 
 		<!-- Custom styles for this template -->
 		<?= HTML::css_link('/css/uoj-theme.css?v=2.3333') ?>
@@ -72,7 +72,8 @@
 		<?php endif ?>
 		
 		<!-- Include all compiled plugins (below), or include individual files as needed -->
-		<?= HTML::js_src('/js/bootstrap.min.js?v=2015.5.31') ?>
+		<?= HTML::js_src('/js/popper.min.js?v=2019.5.31') ?>
+		<?= HTML::js_src('/js/bootstrap.min.js?v=2019.5.31') ?>
 		
 		<!-- Color converter -->
 		<?= HTML::js_src('/js/color-converter.min.js') ?>
@@ -86,8 +87,8 @@
 		<!-- LAB -->
 		<?= HTML::js_src('/js/LAB.min.js') ?>
 
-		<!-- UOJ ico -->
-		<link rel="shortcut icon" href="<?= HTML::url('/pictures/UOJ.ico') ?>" />
+		<!-- favicon -->
+		<link rel="shortcut icon" href="<?= HTML::url('/images/favicon.ico') ?>" />
 		
 		<?php if (isset($REQUIRE_LIB['blog-editor'])): ?>
 		<!-- UOJ blog editor -->
@@ -226,29 +227,29 @@
 		<div class="container theme-showcase" role="main">
 			<?php if ($ShowPageHeader): ?>
 			<div>
-				<ul class="nav nav-pills pull-right" role="tablist">
+				<ul class="nav nav-pills float-right" role="tablist">
 				<?php if (Auth::check()): ?>
-					<li class="dropdown">
-						<a href="#" data-toggle="dropdown">
+					<li class="nav-item dropdown">
+						<a class="nav-link dropdown-toggle" href="#" data-toggle="dropdown">
 							<span class="uoj-username" data-rating="<?= Auth::user()['rating'] ?>" data-link="0"><?= Auth::id() ?></span> <?= $new_msg_tot_html ?>
 						</a>
 						<ul class="dropdown-menu" role="menu">
-							<li role="presentation"><a href="<?= HTML::url('/user/profile/' . Auth::id()) ?>"><?= UOJLocale::get('my profile') ?></a></li>
-							<li role="presentation"><a href="<?= HTML::url('/user/msg') ?>"><?= UOJLocale::get('private message') ?>&nbsp;&nbsp;<?= $new_user_msg_num_html ?></a></li>
-							<li role="presentation"><a href="<?= HTML::url('/user/system-msg') ?>"><?= UOJLocale::get('system message') ?>&nbsp;&nbsp;<?= $new_system_msg_num_html ?></a></li>
+							<li role="presentation"><a class="dropdown-item" href="<?= HTML::url('/user/profile/' . Auth::id()) ?>"><?= UOJLocale::get('my profile') ?></a></li>
+							<li role="presentation"><a class="dropdown-item" href="<?= HTML::url('/user/msg') ?>"><?= UOJLocale::get('private message') ?>&nbsp;&nbsp;<?= $new_user_msg_num_html ?></a></li>
+							<li role="presentation"><a class="dropdown-item" href="<?= HTML::url('/user/system-msg') ?>"><?= UOJLocale::get('system message') ?>&nbsp;&nbsp;<?= $new_system_msg_num_html ?></a></li>
 							<?php if (isSuperUser(Auth::user())): ?>
-								<li role="presentation"><a href="<?= HTML::url('/super-manage') ?>"><?= UOJLocale::get('system manage') ?></a></li>
+								<li role="presentation"><a class="dropdown-item" href="<?= HTML::url('/super-manage') ?>"><?= UOJLocale::get('system manage') ?></a></li>
 							<?php endif ?>
 						</ul>
 					</li>
-					<li role="presentation"><a href="<?= HTML::url('/logout?_token='.crsf_token()) ?>"><?= UOJLocale::get('logout') ?></a></li>
+					<li class="nav-item" role="presentation"><a class="nav-link" href="<?= HTML::url('/logout?_token='.crsf_token()) ?>"><?= UOJLocale::get('logout') ?></a></li>
 				<?php else: ?>
-					<li role="presentation"><a href="<?= HTML::url('/login') ?>"><?= UOJLocale::get('login') ?></a></li>
-					<li role="presentation"><a href="<?= HTML::url('/register') ?>"><?= UOJLocale::get('register') ?></a></li>
+					<li class="nav-item" role="presentation"><a class="nav-link" href="<?= HTML::url('/login') ?>"><?= UOJLocale::get('login') ?></a></li>
+					<li class="nav-item" role="presentation"><a class="nav-link" href="<?= HTML::url('/register') ?>"><?= UOJLocale::get('register') ?></a></li>
 				<?php endif ?>
 				</ul>
-				<h1 class="hidden-xs"><a href="<?= HTML::url('/') ?>"><img src="<?= HTML::url('/pictures/UOJ_small.png') ?>" alt="UOJ Logo" class="img-rounded" style="width:39px; height:39px;" /></a> <?= $PageMainTitle ?></h1>
-				<h1 class="visible-xs"><?= $PageMainTitleOnSmall ?></h1>
+				<h1 class="d-none d-sm-block"><a href="<?= HTML::url('/') ?>"><img src="<?= HTML::url('/images/logo_small.png') ?>" alt="Logo" class="img-rounded" style="width:39px; height:39px;" /></a> <?= $PageMainTitle ?></h1>
+				<h1 class="d-block d-sm-none"><?= $PageMainTitleOnSmall ?></h1>
 			</div>
 			
 			<?php uojIncludeView($PageNav) ?>
diff --git a/web/css/bootstrap-dialog.min.css b/web/css/bootstrap-dialog.min.css
index d71349f..6bfd3d6 100644
--- a/web/css/bootstrap-dialog.min.css
+++ b/web/css/bootstrap-dialog.min.css
@@ -1 +1 @@
-.bootstrap-dialog .modal-header{border-top-left-radius:4px;border-top-right-radius:4px}.bootstrap-dialog .bootstrap-dialog-title{color:#fff;display:inline-block}.bootstrap-dialog.type-default .bootstrap-dialog-title{color:#333}.bootstrap-dialog.size-normal .bootstrap-dialog-title{font-size:16px}.bootstrap-dialog.size-large .bootstrap-dialog-title{font-size:24px}.bootstrap-dialog .bootstrap-dialog-close-button{float:right;filter:alpha(opacity=90);-moz-opacity:.9;-khtml-opacity:.9;opacity:.9}.bootstrap-dialog.size-normal .bootstrap-dialog-close-button{font-size:20px}.bootstrap-dialog.size-large .bootstrap-dialog-close-button{font-size:30px}.bootstrap-dialog .bootstrap-dialog-close-button:hover{cursor:pointer;filter:alpha(opacity=100);-moz-opacity:1;-khtml-opacity:1;opacity:1}.bootstrap-dialog.size-normal .bootstrap-dialog-message{font-size:14px}.bootstrap-dialog.size-large .bootstrap-dialog-message{font-size:18px}.bootstrap-dialog.type-default .modal-header{background-color:#fff}.bootstrap-dialog.type-info .modal-header{background-color:#5bc0de}.bootstrap-dialog.type-primary .modal-header{background-color:#428bca}.bootstrap-dialog.type-success .modal-header{background-color:#5cb85c}.bootstrap-dialog.type-warning .modal-header{background-color:#f0ad4e}.bootstrap-dialog.type-danger .modal-header{background-color:#d9534f}.bootstrap-dialog .bootstrap-dialog-button-icon{margin-right:3px}.icon-spin{display:inline-block;-moz-animation:spin 2s infinite linear;-o-animation:spin 2s infinite linear;-webkit-animation:spin 2s infinite linear;animation:spin 2s infinite linear}@-moz-keyframes spin{0{-moz-transform:rotate(0)}100%{-moz-transform:rotate(359deg)}}@-webkit-keyframes spin{0{-webkit-transform:rotate(0)}100%{-webkit-transform:rotate(359deg)}}@-o-keyframes spin{0{-o-transform:rotate(0)}100%{-o-transform:rotate(359deg)}}@-ms-keyframes spin{0{-ms-transform:rotate(0)}100%{-ms-transform:rotate(359deg)}}@keyframes spin{0{transform:rotate(0)}100%{transform:rotate(359deg)}}
\ No newline at end of file
+@-moz-keyframes spin{0%{-moz-transform:rotate(0deg)}to{-moz-transform:rotate(359deg)}}@-webkit-keyframes spin{0%{-webkit-transform:rotate(0deg)}to{-webkit-transform:rotate(359deg)}}@-o-keyframes spin{0%{-o-transform:rotate(0deg)}to{-o-transform:rotate(359deg)}}@-ms-keyframes spin{0%{-ms-transform:rotate(0deg)}to{-ms-transform:rotate(359deg)}}@keyframes spin{0%{transform:rotate(0deg)}to{transform:rotate(359deg)}}.bootstrap-dialog .modal-header{border-top-left-radius:4px;border-top-right-radius:4px}.bootstrap-dialog .bootstrap-dialog-title{color:#fff;display:inline-block;font-size:16px}.bootstrap-dialog .bootstrap-dialog-message{font-size:14px}.bootstrap-dialog .bootstrap-dialog-button-icon{margin-right:3px}.bootstrap-dialog .bootstrap-dialog-close-button{font-size:20px;float:right;opacity:.9;filter:alpha(opacity=90)}.bootstrap-dialog .bootstrap-dialog-close-button:hover{cursor:pointer;opacity:1;filter:alpha(opacity=100)}@media (min-width:1172px){.bootstrap-dialog .modal-xl{max-width:95%}}.bootstrap-dialog .modal-lg .bootstrap4-dialog-button:first-child{margin-top:8px}.bootstrap-dialog.type-default .modal-header{background-color:#fff}.bootstrap-dialog.type-default .bootstrap-dialog-title{color:#333}.bootstrap-dialog.type-info .modal-header{background-color:#17a2b8}.bootstrap-dialog.type-primary .modal-header{background-color:#007bff}.bootstrap-dialog.type-secondary .modal-header{background-color:#6c757d}.bootstrap-dialog.type-success .modal-header{background-color:#28a745}.bootstrap-dialog.type-warning .modal-header{background-color:#ffc107}.bootstrap-dialog.type-danger .modal-header{background-color:#dc3545}.bootstrap-dialog.type-light .modal-header{background-color:#f8f9fa}.bootstrap-dialog.type-dark .modal-header{background-color:#343a40}.bootstrap-dialog.size-large .bootstrap-dialog-title{font-size:24px}.bootstrap-dialog.size-large .bootstrap-dialog-close-button{font-size:30px}.bootstrap-dialog.size-large .bootstrap-dialog-message{font-size:18px}.bootstrap-dialog .icon-spin{display:inline-block;-moz-animation:spin 2s infinite linear;-o-animation:spin 2s infinite linear;-webkit-animation:spin 2s infinite linear;animation:spin 2s infinite linear}.bootstrap-dialog-header{display:contents}
\ No newline at end of file
diff --git a/web/css/bootstrap-glyphicons.min.css b/web/css/bootstrap-glyphicons.min.css
new file mode 100644
index 0000000..040eb6f
--- /dev/null
+++ b/web/css/bootstrap-glyphicons.min.css
@@ -0,0 +1,6 @@
+/*!
+ * Bootstrap v3.3.7 (http://getbootstrap.com)
+ * Copyright 2011-2018 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ */
+@font-face{font-family:'Glyphicons Halflings';src:url('../fonts/glyphicons/glyphicons-halflings-regular.eot?');src:url('../fonts/glyphicons/glyphicons-halflings-regular.eot?#iefix') format('embedded-opentype'),url('../fonts/glyphicons/glyphicons-halflings-regular.woff2') format('woff2'),url('../fonts/glyphicons/glyphicons-halflings-regular.woff') format('woff'),url('../fonts/glyphicons/glyphicons-halflings-regular.ttf') format('truetype'),url('../fonts/glyphicons/glyphicons-halflings-regular.svg#glyphicons_halflingsregular') format('svg')}.glyphicon{position:relative;top:1px;display:inline-block;font-family:'Glyphicons Halflings';font-style:normal;font-weight:normal;line-height:1;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.glyphicon-asterisk:before{content:"*"}.glyphicon-plus:before{content:"+"}.glyphicon-euro:before,.glyphicon-eur:before{content:"€"}.glyphicon-minus:before{content:"−"}.glyphicon-cloud:before{content:"☁"}.glyphicon-envelope:before{content:"✉"}.glyphicon-pencil:before{content:"✏"}.glyphicon-glass:before{content:""}.glyphicon-music:before{content:""}.glyphicon-search:before{content:""}.glyphicon-heart:before{content:""}.glyphicon-star:before{content:""}.glyphicon-star-empty:before{content:""}.glyphicon-user:before{content:""}.glyphicon-film:before{content:""}.glyphicon-th-large:before{content:""}.glyphicon-th:before{content:""}.glyphicon-th-list:before{content:""}.glyphicon-ok:before{content:""}.glyphicon-remove:before{content:""}.glyphicon-zoom-in:before{content:""}.glyphicon-zoom-out:before{content:""}.glyphicon-off:before{content:""}.glyphicon-signal:before{content:""}.glyphicon-cog:before{content:""}.glyphicon-trash:before{content:""}.glyphicon-home:before{content:""}.glyphicon-file:before{content:""}.glyphicon-time:before{content:""}.glyphicon-road:before{content:""}.glyphicon-download-alt:before{content:""}.glyphicon-download:before{content:""}.glyphicon-upload:before{content:""}.glyphicon-inbox:before{content:""}.glyphicon-play-circle:before{content:""}.glyphicon-repeat:before{content:""}.glyphicon-refresh:before{content:""}.glyphicon-list-alt:before{content:""}.glyphicon-lock:before{content:""}.glyphicon-flag:before{content:""}.glyphicon-headphones:before{content:""}.glyphicon-volume-off:before{content:""}.glyphicon-volume-down:before{content:""}.glyphicon-volume-up:before{content:""}.glyphicon-qrcode:before{content:""}.glyphicon-barcode:before{content:""}.glyphicon-tag:before{content:""}.glyphicon-tags:before{content:""}.glyphicon-book:before{content:""}.glyphicon-bookmark:before{content:""}.glyphicon-print:before{content:""}.glyphicon-camera:before{content:""}.glyphicon-font:before{content:""}.glyphicon-bold:before{content:""}.glyphicon-italic:before{content:""}.glyphicon-text-height:before{content:""}.glyphicon-text-width:before{content:""}.glyphicon-align-left:before{content:""}.glyphicon-align-center:before{content:""}.glyphicon-align-right:before{content:""}.glyphicon-align-justify:before{content:""}.glyphicon-list:before{content:""}.glyphicon-indent-left:before{content:""}.glyphicon-indent-right:before{content:""}.glyphicon-facetime-video:before{content:""}.glyphicon-picture:before{content:""}.glyphicon-map-marker:before{content:""}.glyphicon-adjust:before{content:""}.glyphicon-tint:before{content:""}.glyphicon-edit:before{content:""}.glyphicon-share:before{content:""}.glyphicon-check:before{content:""}.glyphicon-move:before{content:""}.glyphicon-step-backward:before{content:""}.glyphicon-fast-backward:before{content:""}.glyphicon-backward:before{content:""}.glyphicon-play:before{content:""}.glyphicon-pause:before{content:""}.glyphicon-stop:before{content:""}.glyphicon-forward:before{content:""}.glyphicon-fast-forward:before{content:""}.glyphicon-step-forward:before{content:""}.glyphicon-eject:before{content:""}.glyphicon-chevron-left:before{content:""}.glyphicon-chevron-right:before{content:""}.glyphicon-plus-sign:before{content:""}.glyphicon-minus-sign:before{content:""}.glyphicon-remove-sign:before{content:""}.glyphicon-ok-sign:before{content:""}.glyphicon-question-sign:before{content:""}.glyphicon-info-sign:before{content:""}.glyphicon-screenshot:before{content:""}.glyphicon-remove-circle:before{content:""}.glyphicon-ok-circle:before{content:""}.glyphicon-ban-circle:before{content:""}.glyphicon-arrow-left:before{content:""}.glyphicon-arrow-right:before{content:""}.glyphicon-arrow-up:before{content:""}.glyphicon-arrow-down:before{content:""}.glyphicon-share-alt:before{content:""}.glyphicon-resize-full:before{content:""}.glyphicon-resize-small:before{content:""}.glyphicon-exclamation-sign:before{content:""}.glyphicon-gift:before{content:""}.glyphicon-leaf:before{content:""}.glyphicon-fire:before{content:""}.glyphicon-eye-open:before{content:""}.glyphicon-eye-close:before{content:""}.glyphicon-warning-sign:before{content:""}.glyphicon-plane:before{content:""}.glyphicon-calendar:before{content:""}.glyphicon-random:before{content:""}.glyphicon-comment:before{content:""}.glyphicon-magnet:before{content:""}.glyphicon-chevron-up:before{content:""}.glyphicon-chevron-down:before{content:""}.glyphicon-retweet:before{content:""}.glyphicon-shopping-cart:before{content:""}.glyphicon-folder-close:before{content:""}.glyphicon-folder-open:before{content:""}.glyphicon-resize-vertical:before{content:""}.glyphicon-resize-horizontal:before{content:""}.glyphicon-hdd:before{content:""}.glyphicon-bullhorn:before{content:""}.glyphicon-bell:before{content:""}.glyphicon-certificate:before{content:""}.glyphicon-thumbs-up:before{content:""}.glyphicon-thumbs-down:before{content:""}.glyphicon-hand-right:before{content:""}.glyphicon-hand-left:before{content:""}.glyphicon-hand-up:before{content:""}.glyphicon-hand-down:before{content:""}.glyphicon-circle-arrow-right:before{content:""}.glyphicon-circle-arrow-left:before{content:""}.glyphicon-circle-arrow-up:before{content:""}.glyphicon-circle-arrow-down:before{content:""}.glyphicon-globe:before{content:""}.glyphicon-wrench:before{content:""}.glyphicon-tasks:before{content:""}.glyphicon-filter:before{content:""}.glyphicon-briefcase:before{content:""}.glyphicon-fullscreen:before{content:""}.glyphicon-dashboard:before{content:""}.glyphicon-paperclip:before{content:""}.glyphicon-heart-empty:before{content:""}.glyphicon-link:before{content:""}.glyphicon-phone:before{content:""}.glyphicon-pushpin:before{content:""}.glyphicon-usd:before{content:""}.glyphicon-gbp:before{content:""}.glyphicon-sort:before{content:""}.glyphicon-sort-by-alphabet:before{content:""}.glyphicon-sort-by-alphabet-alt:before{content:""}.glyphicon-sort-by-order:before{content:""}.glyphicon-sort-by-order-alt:before{content:""}.glyphicon-sort-by-attributes:before{content:""}.glyphicon-sort-by-attributes-alt:before{content:""}.glyphicon-unchecked:before{content:""}.glyphicon-expand:before{content:""}.glyphicon-collapse-down:before{content:""}.glyphicon-collapse-up:before{content:""}.glyphicon-log-in:before{content:""}.glyphicon-flash:before{content:""}.glyphicon-log-out:before{content:""}.glyphicon-new-window:before{content:""}.glyphicon-record:before{content:""}.glyphicon-save:before{content:""}.glyphicon-open:before{content:""}.glyphicon-saved:before{content:""}.glyphicon-import:before{content:""}.glyphicon-export:before{content:""}.glyphicon-send:before{content:""}.glyphicon-floppy-disk:before{content:""}.glyphicon-floppy-saved:before{content:""}.glyphicon-floppy-remove:before{content:""}.glyphicon-floppy-save:before{content:""}.glyphicon-floppy-open:before{content:""}.glyphicon-credit-card:before{content:""}.glyphicon-transfer:before{content:""}.glyphicon-cutlery:before{content:""}.glyphicon-header:before{content:""}.glyphicon-compressed:before{content:""}.glyphicon-earphone:before{content:""}.glyphicon-phone-alt:before{content:""}.glyphicon-tower:before{content:""}.glyphicon-stats:before{content:""}.glyphicon-sd-video:before{content:""}.glyphicon-hd-video:before{content:""}.glyphicon-subtitles:before{content:""}.glyphicon-sound-stereo:before{content:""}.glyphicon-sound-dolby:before{content:""}.glyphicon-sound-5-1:before{content:""}.glyphicon-sound-6-1:before{content:""}.glyphicon-sound-7-1:before{content:""}.glyphicon-copyright-mark:before{content:""}.glyphicon-registration-mark:before{content:""}.glyphicon-cloud-download:before{content:""}.glyphicon-cloud-upload:before{content:""}.glyphicon-tree-conifer:before{content:""}.glyphicon-tree-deciduous:before{content:""}.glyphicon-cd:before{content:""}.glyphicon-save-file:before{content:""}.glyphicon-open-file:before{content:""}.glyphicon-level-up:before{content:""}.glyphicon-copy:before{content:""}.glyphicon-paste:before{content:""}.glyphicon-alert:before{content:""}.glyphicon-equalizer:before{content:""}.glyphicon-king:before{content:""}.glyphicon-queen:before{content:""}.glyphicon-pawn:before{content:""}.glyphicon-bishop:before{content:""}.glyphicon-knight:before{content:""}.glyphicon-baby-formula:before{content:""}.glyphicon-tent:before{content:"⛺"}.glyphicon-blackboard:before{content:""}.glyphicon-bed:before{content:""}.glyphicon-apple:before{content:""}.glyphicon-erase:before{content:""}.glyphicon-hourglass:before{content:"⌛"}.glyphicon-lamp:before{content:""}.glyphicon-duplicate:before{content:""}.glyphicon-piggy-bank:before{content:""}.glyphicon-scissors:before{content:""}.glyphicon-bitcoin:before{content:""}.glyphicon-btc:before{content:""}.glyphicon-xbt:before{content:""}.glyphicon-yen:before{content:"¥"}.glyphicon-jpy:before{content:"¥"}.glyphicon-ruble:before{content:"₽"}.glyphicon-rub:before{content:"₽"}.glyphicon-scale:before{content:""}.glyphicon-ice-lolly:before{content:""}.glyphicon-ice-lolly-tasted:before{content:""}.glyphicon-education:before{content:""}.glyphicon-option-horizontal:before{content:""}.glyphicon-option-vertical:before{content:""}.glyphicon-menu-hamburger:before{content:""}.glyphicon-modal-window:before{content:""}.glyphicon-oil:before{content:""}.glyphicon-grain:before{content:""}.glyphicon-sunglasses:before{content:""}.glyphicon-text-size:before{content:""}.glyphicon-text-color:before{content:""}.glyphicon-text-background:before{content:""}.glyphicon-object-align-top:before{content:""}.glyphicon-object-align-bottom:before{content:""}.glyphicon-object-align-horizontal:before{content:""}.glyphicon-object-align-left:before{content:""}.glyphicon-object-align-vertical:before{content:""}.glyphicon-object-align-right:before{content:""}.glyphicon-triangle-right:before{content:""}.glyphicon-triangle-left:before{content:""}.glyphicon-triangle-bottom:before{content:""}.glyphicon-triangle-top:before{content:""}.glyphicon-console:before{content:""}.glyphicon-superscript:before{content:""}.glyphicon-subscript:before{content:""}.glyphicon-menu-left:before{content:""}.glyphicon-menu-right:before{content:""}.glyphicon-menu-down:before{content:""}.glyphicon-menu-up:before{content:""}
\ No newline at end of file
diff --git a/web/css/bootstrap.min.css b/web/css/bootstrap.min.css
index 5e7e96c..92e3fe8 100644
--- a/web/css/bootstrap.min.css
+++ b/web/css/bootstrap.min.css
@@ -1,10 +1,7 @@
 /*!
- * Bootstrap v3.3.4 (http://getbootstrap.com)
- * Copyright 2011-2015 Twitter, Inc.
+ * Bootstrap v4.3.1 (https://getbootstrap.com/)
+ * Copyright 2011-2019 The Bootstrap Authors
+ * Copyright 2011-2019 Twitter, Inc.
  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
- */
-
-/*!
- * Generated using the Bootstrap Customizer (http://v3.bootcss.com/customize/?id=b20ac20703111d3719f9)
- * Config saved to config.json and https://gist.github.com/b20ac20703111d3719f9
- *//*! normalize.css v3.0.2 | MIT License | git.io/normalize */html{font-family:sans-serif;-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%}body{margin:0}article,aside,details,figcaption,figure,footer,header,hgroup,main,menu,nav,section,summary{display:block}audio,canvas,progress,video{display:inline-block;vertical-align:baseline}audio:not([controls]){display:none;height:0}[hidden],template{display:none}a{background-color:transparent}a:active,a:hover{outline:0}abbr[title]{border-bottom:1px dotted}b,strong{font-weight:bold}dfn{font-style:italic}h1{font-size:2em;margin:0.67em 0}mark{background:#ff0;color:#000}small{font-size:80%}sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}sup{top:-0.5em}sub{bottom:-0.25em}img{border:0}svg:not(:root){overflow:hidden}figure{margin:1em 40px}hr{-moz-box-sizing:content-box;-webkit-box-sizing:content-box;box-sizing:content-box;height:0}pre{overflow:auto}code,kbd,pre,samp{font-family:monospace, monospace;font-size:1em}button,input,optgroup,select,textarea{color:inherit;font:inherit;margin:0}button{overflow:visible}button,select{text-transform:none}button,html input[type="button"],input[type="reset"],input[type="submit"]{-webkit-appearance:button;cursor:pointer}button[disabled],html input[disabled]{cursor:default}button::-moz-focus-inner,input::-moz-focus-inner{border:0;padding:0}input{line-height:normal}input[type="checkbox"],input[type="radio"]{-webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box;padding:0}input[type="number"]::-webkit-inner-spin-button,input[type="number"]::-webkit-outer-spin-button{height:auto}input[type="search"]{-webkit-appearance:textfield;-moz-box-sizing:content-box;-webkit-box-sizing:content-box;box-sizing:content-box}input[type="search"]::-webkit-search-cancel-button,input[type="search"]::-webkit-search-decoration{-webkit-appearance:none}fieldset{border:1px solid #c0c0c0;margin:0 2px;padding:0.35em 0.625em 0.75em}legend{border:0;padding:0}textarea{overflow:auto}optgroup{font-weight:bold}table{border-collapse:collapse;border-spacing:0}td,th{padding:0}/*! Source: https://github.com/h5bp/html5-boilerplate/blob/master/src/css/main.css */@media print{*,*:before,*:after{background:transparent !important;color:#000 !important;-webkit-box-shadow:none !important;box-shadow:none !important;text-shadow:none !important}a,a:visited{text-decoration:underline}a[href]:after{content:" (" attr(href) ")"}abbr[title]:after{content:" (" attr(title) ")"}a[href^="#"]:after,a[href^="javascript:"]:after{content:""}pre,blockquote{border:1px solid #999;page-break-inside:avoid}thead{display:table-header-group}tr,img{page-break-inside:avoid}img{max-width:100% !important}p,h2,h3{orphans:3;widows:3}h2,h3{page-break-after:avoid}select{background:#fff !important}.navbar{display:none}.btn>.caret,.dropup>.btn>.caret{border-top-color:#000 !important}.label{border:1px solid #000}.table{border-collapse:collapse !important}.table td,.table th{background-color:#fff !important}.table-bordered th,.table-bordered td{border:1px solid #ddd 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a;color:transparent;text-shadow:none;background-color:transparent;border:0}.text-decoration-none{text-decoration:none!important}.text-break{word-break:break-word!important;overflow-wrap:break-word!important}.text-reset{color:inherit!important}.visible{visibility:visible!important}.invisible{visibility:hidden!important}@media print{*,::after,::before{text-shadow:none!important;box-shadow:none!important}a:not(.btn){text-decoration:underline}abbr[title]::after{content:" (" attr(title) ")"}pre{white-space:pre-wrap!important}blockquote,pre{border:1px solid #adb5bd;page-break-inside:avoid}thead{display:table-header-group}img,tr{page-break-inside:avoid}h2,h3,p{orphans:3;widows:3}h2,h3{page-break-after:avoid}@page{size:a3}body{min-width:992px!important}.container{min-width:992px!important}.navbar{display:none}.badge{border:1px solid #000}.table{border-collapse:collapse!important}.table td,.table th{background-color:#fff!important}.table-bordered td,.table-bordered th{border:1px solid #dee2e6!important}.table-dark{color:inherit}.table-dark tbody+tbody,.table-dark td,.table-dark th,.table-dark thead th{border-color:#dee2e6}.table .thead-dark th{color:inherit;border-color:#dee2e6}}
+/*# sourceMappingURL=bootstrap.min.css.map */
\ No newline at end of file
diff --git a/web/css/uoj-theme.css b/web/css/uoj-theme.css
index 897aaaf..61580a8 100644
--- a/web/css/uoj-theme.css
+++ b/web/css/uoj-theme.css
@@ -1,3 +1,7 @@
+html {
+	font-size: 14px
+}
+
 body {
 	padding-top: 10px;
 	padding-bottom: 10px;
@@ -19,6 +23,12 @@ body {
 	color: gray;
 }
 
+.page-header {
+	padding-bottom: 9px;
+	margin: 40px 0 20px;
+	border-bottom: 1px solid #eee;
+}
+
 a.header-a {
 	color: #333;
 }
@@ -49,9 +59,14 @@ article img {
 }
 
 pre {
-    -moz-tab-size: 4;
-    -o-tab-size: 4;
-    tab-size: 4;
+	-moz-tab-size: 4;
+	-o-tab-size: 4;
+	tab-size: 4;
+	padding: 9.5px;
+	margin: 0 0 10px;
+	background-color: #f5f5f5;
+	border: 1px solid #ccc;
+	border-radius: 4px;
 }
 
 .uoj-username {
@@ -65,107 +80,107 @@ pre {
 	font-weight: 700;
 }
 
-.panel-uoj-accepted {
+.card-uoj-accepted {
 	border-color:#2bff4f;
 }
-.panel-uoj-accepted>.panel-heading {
+.card-uoj-accepted>.card-header {
 	cursor:pointer;
 	color:#333;
 	background-color:#00ee00;
 	border-color:#2bff4f;
 }
-.panel-uoj-accepted>.panel-heading:hover {
+.card-uoj-accepted>.card-header:hover {
 	background-color:#2bff4f;
 }
-.panel-uoj-accepted>.panel-heading+.panel-collapse>.panel-body {
+.card-uoj-accepted>.card-header+.card-collapse>.card-body {
 	border-top-color:#00ee00;
 }
-.panel-uoj-accepted>.panel-heading .badge {
+.card-uoj-accepted>.card-header .badge {
 	color:#00ee00;
 	background-color:#333;
 }
-.panel-uoj-accepted>.panel-heading:hover .badge {
+.card-uoj-accepted>.card-header:hover .badge {
 	color:#2bff4f;
 }
-.panel-uoj-accepted>.panel-footer+.panel-collapse>.panel-body {
+.card-uoj-accepted>.card-footer+.card-collapse>.card-body {
 	border-bottom-color:#2bff4f;
 }
 
-.panel-uoj-wrong {
+.card-uoj-wrong {
 	border-color:#ff0000;
 }
-.panel-uoj-wrong>.panel-heading {
+.card-uoj-wrong>.card-header {
 	cursor:pointer;
 	color:#333;
 	background-color:#dd0000;
 	border-color:#ff0000;
 }
-.panel-uoj-wrong>.panel-heading:hover {
+.card-uoj-wrong>.card-header:hover {
 	background-color:#ff0000;
 }
-.panel-uoj-wrong>.panel-heading+.panel-collapse>.panel-body {
+.card-uoj-wrong>.card-header+.card-collapse>.card-body {
 	border-top-color:#dd0000;
 }
-.panel-uoj-wrong>.panel-heading .badge {
+.card-uoj-wrong>.card-header .badge {
 	color:#dd0000;
 	background-color:#333;
 }
-.panel-uoj-wrong>.panel-heading:hover .badge {
+.card-uoj-wrong>.card-header:hover .badge {
 	color:#ff0000;
 }
-.panel-uoj-wrong>.panel-footer+.panel-collapse>.panel-body {
+.card-uoj-wrong>.card-footer+.card-collapse>.card-body {
 	border-bottom-color:#ff0000;
 }
 
-.panel-uoj-acceptable-answer {
+.card-uoj-acceptable-answer {
 	border-color:#ff7700;
 }
-.panel-uoj-acceptable-answer>.panel-heading {
+.card-uoj-acceptable-answer>.card-header {
 	cursor:pointer;
 	color:#333;
 	background-color:#ee5500;
 	border-color:#ff0000;
 }
-.panel-uoj-acceptable-answer>.panel-heading:hover {
+.card-uoj-acceptable-answer>.card-header:hover {
 	background-color:#ff7700;
 }
-.panel-uoj-acceptable-answer>.panel-heading+.panel-collapse>.panel-body {
+.card-uoj-acceptable-answer>.card-header+.card-collapse>.card-body {
 	border-top-color:#ee5500;
 }
-.panel-uoj-acceptable-answer>.panel-heading .badge {
+.card-uoj-acceptable-answer>.card-header .badge {
 	color:#ff7700;
 	background-color:#333;
 }
-.panel-uoj-acceptable-answer>.panel-heading:hover .badge {
+.card-uoj-acceptable-answer>.card-header:hover .badge {
 	color:#ff7700;
 }
-.panel-uoj-acceptable-answer>.panel-footer+.panel-collapse>.panel-body {
+.card-uoj-acceptable-answer>.card-footer+.card-collapse>.card-body {
 	border-bottom-color:#ff7700;
 }
 
-.panel-uoj-tle {
+.card-uoj-tle {
 	border-color:#ffff2b;
 }
-.panel-uoj-tle>.panel-heading {
+.card-uoj-tle>.card-header {
 	cursor:pointer;
 	color:#333;
 	background-color:#e6e61e;
 	border-color:#ffff2b;
 }
-.panel-uoj-tle>.panel-heading:hover {
+.card-uoj-tle>.card-header:hover {
 	background-color:#ffff2b;
 }
-.panel-uoj-tle>.panel-heading+.panel-collapse>.panel-body {
+.card-uoj-tle>.card-header+.card-collapse>.card-body {
 	border-top-color:#ffff2b;
 }
-.panel-uoj-tle>.panel-heading .badge {
+.card-uoj-tle>.card-header .badge {
 	color:#e6e61e;
 	background-color:#333;
 }
-.panel-uoj-tle>.panel-heading:hover .badge {
+.card-uoj-tle>.card-header:hover .badge {
 	color:#ffff2b;
 }
-.panel-uoj-tle>.panel-footer+.panel-collapse>.panel-body {
+.card-uoj-tle>.card-footer+.card-collapse>.card-body {
 	border-bottom-color:#ffff2b;
 }
 
diff --git a/web/fonts/glyphicons-halflings-regular.eot b/web/fonts/glyphicons/glyphicons-halflings-regular.eot
similarity index 100%
rename from web/fonts/glyphicons-halflings-regular.eot
rename to web/fonts/glyphicons/glyphicons-halflings-regular.eot
diff --git a/web/fonts/glyphicons-halflings-regular.svg b/web/fonts/glyphicons/glyphicons-halflings-regular.svg
similarity index 100%
rename from web/fonts/glyphicons-halflings-regular.svg
rename to web/fonts/glyphicons/glyphicons-halflings-regular.svg
diff --git a/web/fonts/glyphicons-halflings-regular.ttf b/web/fonts/glyphicons/glyphicons-halflings-regular.ttf
similarity index 100%
rename from web/fonts/glyphicons-halflings-regular.ttf
rename to web/fonts/glyphicons/glyphicons-halflings-regular.ttf
diff --git a/web/fonts/glyphicons-halflings-regular.woff b/web/fonts/glyphicons/glyphicons-halflings-regular.woff
similarity index 100%
rename from web/fonts/glyphicons-halflings-regular.woff
rename to web/fonts/glyphicons/glyphicons-halflings-regular.woff
diff --git a/web/fonts/glyphicons-halflings-regular.woff2 b/web/fonts/glyphicons/glyphicons-halflings-regular.woff2
similarity index 100%
rename from web/fonts/glyphicons-halflings-regular.woff2
rename to web/fonts/glyphicons/glyphicons-halflings-regular.woff2
diff --git a/web/pictures/earth_man.png b/web/images/earth_man.png
similarity index 100%
rename from web/pictures/earth_man.png
rename to web/images/earth_man.png
diff --git a/web/images/favicon.ico b/web/images/favicon.ico
new file mode 100644
index 0000000..51b95f3
Binary files /dev/null and b/web/images/favicon.ico differ
diff --git a/web/images/logo.png b/web/images/logo.png
new file mode 100644
index 0000000..c70d9e2
Binary files /dev/null and b/web/images/logo.png differ
diff --git a/web/images/logo_big.png b/web/images/logo_big.png
new file mode 100644
index 0000000..61312ee
Binary files /dev/null and b/web/images/logo_big.png differ
diff --git a/web/images/logo_small.png b/web/images/logo_small.png
new file mode 100644
index 0000000..6a4247d
Binary files /dev/null and b/web/images/logo_small.png differ
diff --git a/web/js/blog-editor/blog-editor.js b/web/js/blog-editor/blog-editor.js
index ed3a79d..e55d818 100644
--- a/web/js/blog-editor/blog-editor.js
+++ b/web/js/blog-editor/blog-editor.js
@@ -18,9 +18,9 @@ function blog_editor_init(name, editor_config) {
 	
 	// init buttons
 	var save_btn = $('<button type="button" class="btn btn-sm"></button>');
-	var preview_btn = $('<button type="button" class="btn btn-default btn-sm"><span class="glyphicon glyphicon-eye-open"></span></button>');
-	var bold_btn = $('<button type="button" class="btn btn-default btn-sm"><span class="glyphicon glyphicon-bold"></span></button>');
-	var italic_btn = $('<button type="button" class="btn btn-default btn-sm"><span class="glyphicon glyphicon-italic"></span></button>');
+	var preview_btn = $('<button type="button" class="btn btn-secondary btn-sm"><span class="glyphicon glyphicon-eye-open"></span></button>');
+	var bold_btn = $('<button type="button" class="btn btn-secondary btn-sm ml-2"><span class="glyphicon glyphicon-bold"></span></button>');
+	var italic_btn = $('<button type="button" class="btn btn-secondary btn-sm"><span class="glyphicon glyphicon-italic"></span></button>');
 	
 	save_btn.tooltip({ container: 'body', title: '保存 (Ctrl-S)' });
 	preview_btn.tooltip({ container: 'body', title: '预览 (Ctrl-D)' 	});
diff --git a/web/js/bootstrap-dialog.min.js b/web/js/bootstrap-dialog.min.js
index e597989..ed1c777 100644
--- a/web/js/bootstrap-dialog.min.js
+++ b/web/js/bootstrap-dialog.min.js
@@ -1 +1 @@
-(function(a,b){if(typeof module!=="undefined"&&module.exports){module.exports=b(require("jquery")(a))}else{if(typeof define==="function"&&define.amd){define("bootstrap-dialog",["jquery"],function(c){return b(c)})}else{a.BootstrapDialog=b(a.jQuery)}}}(this,function(b){var a=function(c){this.defaultOptions=b.extend(true,{id:a.newGuid(),buttons:[],data:{},onshow:null,onshown:null,onhide:null,onhidden:null},a.defaultOptions);this.indexedButtons={};this.registeredButtonHotkeys={};this.draggableData={isMouseDown:false,mouseOffset:{}};this.realized=false;this.opened=false;this.initOptions(c);this.holdThisInstance()};a.NAMESPACE="bootstrap-dialog";a.TYPE_DEFAULT="type-default";a.TYPE_INFO="type-info";a.TYPE_PRIMARY="type-primary";a.TYPE_SUCCESS="type-success";a.TYPE_WARNING="type-warning";a.TYPE_DANGER="type-danger";a.DEFAULT_TEXTS={};a.DEFAULT_TEXTS[a.TYPE_DEFAULT]="Information";a.DEFAULT_TEXTS[a.TYPE_INFO]="Information";a.DEFAULT_TEXTS[a.TYPE_PRIMARY]="Information";a.DEFAULT_TEXTS[a.TYPE_SUCCESS]="Success";a.DEFAULT_TEXTS[a.TYPE_WARNING]="Warning";a.DEFAULT_TEXTS[a.TYPE_DANGER]="Danger";a.SIZE_NORMAL="size-normal";a.SIZE_LARGE="size-large";a.BUTTON_SIZES={};a.BUTTON_SIZES[a.SIZE_NORMAL]="";a.BUTTON_SIZES[a.SIZE_LARGE]="btn-lg";a.ICON_SPINNER="glyphicon glyphicon-asterisk";a.ZINDEX_BACKDROP=1040;a.ZINDEX_MODAL=1050;a.defaultOptions={type:a.TYPE_PRIMARY,size:a.SIZE_NORMAL,cssClass:"",title:null,message:null,nl2br:true,closable:true,closeByBackdrop:true,closeByKeyboard:true,spinicon:a.ICON_SPINNER,autodestroy:true,draggable:false,animate:true};a.configDefaultOptions=function(c){a.defaultOptions=b.extend(true,a.defaultOptions,c)};a.dialogs={};a.openAll=function(){b.each(a.dialogs,function(d,c){c.open()})};a.closeAll=function(){b.each(a.dialogs,function(d,c){c.close()})};a.moveFocus=function(){var c=null;b.each(a.dialogs,function(e,d){c=d});if(c!==null&&c.isRealized()){c.getModal().focus()}};a.showScrollbar=function(){var c=null;b.each(a.dialogs,function(f,e){c=e});if(c!==null&&c.isRealized()&&c.isOpened()){var d=c.getModal().data("bs.modal");d.checkScrollbar();b("body").addClass("modal-open");d.setScrollbar()}};a.prototype={constructor:a,initOptions:function(c){this.options=b.extend(true,this.defaultOptions,c);return this},holdThisInstance:function(){a.dialogs[this.getId()]=this;return this},initModalStuff:function(){this.setModal(this.createModal()).setModalDialog(this.createModalDialog()).setModalContent(this.createModalContent()).setModalHeader(this.createModalHeader()).setModalBody(this.createModalBody()).setModalFooter(this.createModalFooter());this.getModal().append(this.getModalDialog());this.getModalDialog().append(this.getModalContent());this.getModalContent().append(this.getModalHeader()).append(this.getModalBody()).append(this.getModalFooter());return this},createModal:function(){var c=b('<div class="modal" tabindex="-1"></div>');c.prop("id",this.getId());return c},getModal:function(){return this.$modal},setModal:function(c){this.$modal=c;return this},createModalDialog:function(){return b('<div class="modal-dialog"></div>')},getModalDialog:function(){return this.$modalDialog},setModalDialog:function(c){this.$modalDialog=c;return this},createModalContent:function(){return b('<div class="modal-content"></div>')},getModalContent:function(){return this.$modalContent},setModalContent:function(c){this.$modalContent=c;return this},createModalHeader:function(){return b('<div class="modal-header"></div>')},getModalHeader:function(){return this.$modalHeader},setModalHeader:function(c){this.$modalHeader=c;return this},createModalBody:function(){return b('<div class="modal-body"></div>')},getModalBody:function(){return this.$modalBody},setModalBody:function(c){this.$modalBody=c;return this},createModalFooter:function(){return b('<div class="modal-footer"></div>')},getModalFooter:function(){return this.$modalFooter},setModalFooter:function(c){this.$modalFooter=c;return this},createDynamicContent:function(d){var c=null;if(typeof d==="function"){c=d.call(d,this)}else{c=d}if(typeof c==="string"){c=this.formatStringContent(c)}return c},formatStringContent:function(c){if(this.options.nl2br){return c.replace(/\r\n/g,"<br />").replace(/[\r\n]/g,"<br />")}return c},setData:function(c,d){this.options.data[c]=d;return this},getData:function(c){return this.options.data[c]},setId:function(c){this.options.id=c;return this},getId:function(){return this.options.id},getType:function(){return this.options.type},setType:function(c){this.options.type=c;this.updateType();return this},updateType:function(){if(this.isRealized()){var c=[a.TYPE_DEFAULT,a.TYPE_INFO,a.TYPE_PRIMARY,a.TYPE_SUCCESS,a.TYPE_WARNING,a.TYPE_DANGER];this.getModal().removeClass(c.join(" ")).addClass(this.getType())}return this},getSize:function(){return this.options.size},setSize:function(c){this.options.size=c;return this},getCssClass:function(){return this.options.cssClass},setCssClass:function(c){this.options.cssClass=c;return this},getTitle:function(){return this.options.title},setTitle:function(c){this.options.title=c;this.updateTitle();return this},updateTitle:function(){if(this.isRealized()){var c=this.getTitle()!==null?this.createDynamicContent(this.getTitle()):this.getDefaultText();this.getModalHeader().find("."+this.getNamespace("title")).html("").append(c)}return this},getMessage:function(){return this.options.message},setMessage:function(c){this.options.message=c;this.updateMessage();return this},updateMessage:function(){if(this.isRealized()){var c=this.createDynamicContent(this.getMessage());this.getModalBody().find("."+this.getNamespace("message")).html("").append(c)}return this},isClosable:function(){return this.options.closable},setClosable:function(c){this.options.closable=c;this.updateClosable();return this},setCloseByBackdrop:function(c){this.options.closeByBackdrop=c;return this},canCloseByBackdrop:function(){return this.options.closeByBackdrop},setCloseByKeyboard:function(c){this.options.closeByKeyboard=c;return this},canCloseByKeyboard:function(){return this.options.closeByKeyboard},isAnimate:function(){return this.options.animate},setAnimate:function(c){this.options.animate=c;return this},updateAnimate:function(){if(this.isRealized()){this.getModal().toggleClass("fade",this.isAnimate())}return this},getSpinicon:function(){return this.options.spinicon},setSpinicon:function(c){this.options.spinicon=c;return this},addButton:function(c){this.options.buttons.push(c);return this},addButtons:function(d){var c=this;b.each(d,function(e,f){c.addButton(f)});return this},getButtons:function(){return this.options.buttons},setButtons:function(c){this.options.buttons=c;this.updateButtons();return this},getButton:function(c){if(typeof this.indexedButtons[c]!=="undefined"){return this.indexedButtons[c]}return null},getButtonSize:function(){if(typeof a.BUTTON_SIZES[this.getSize()]!=="undefined"){return a.BUTTON_SIZES[this.getSize()]}return""},updateButtons:function(){if(this.isRealized()){if(this.getButtons().length===0){this.getModalFooter().hide()}else{this.getModalFooter().find("."+this.getNamespace("footer")).html("").append(this.createFooterButtons())}}return this},isAutodestroy:function(){return this.options.autodestroy},setAutodestroy:function(c){this.options.autodestroy=c},getDefaultText:function(){return a.DEFAULT_TEXTS[this.getType()]},getNamespace:function(c){return a.NAMESPACE+"-"+c},createHeaderContent:function(){var c=b("<div></div>");c.addClass(this.getNamespace("header"));c.append(this.createTitleContent());c.prepend(this.createCloseButton());return c},createTitleContent:function(){var c=b("<div></div>");c.addClass(this.getNamespace("title"));return c},createCloseButton:function(){var d=b("<div></div>");d.addClass(this.getNamespace("close-button"));var c=b('<button class="close">&times;</button>');d.append(c);d.on("click",{dialog:this},function(e){e.data.dialog.close()});return d},createBodyContent:function(){var c=b("<div></div>");c.addClass(this.getNamespace("body"));c.append(this.createMessageContent());return c},createMessageContent:function(){var c=b("<div></div>");c.addClass(this.getNamespace("message"));return c},createFooterContent:function(){var c=b("<div></div>");c.addClass(this.getNamespace("footer"));return c},createFooterButtons:function(){var c=this;var d=b("<div></div>");d.addClass(this.getNamespace("footer-buttons"));this.indexedButtons={};b.each(this.options.buttons,function(e,f){if(!f.id){f.id=a.newGuid()}var g=c.createButton(f);c.indexedButtons[f.id]=g;d.append(g)});return d},createButton:function(c){var d=b('<button class="btn"></button>');d.addClass(this.getButtonSize());d.prop("id",c.id);if(typeof c.icon!=="undefined"&&b.trim(c.icon)!==""){d.append(this.createButtonIcon(c.icon))}if(typeof c.label!=="undefined"){d.append(c.label)}if(typeof c.cssClass!=="undefined"&&b.trim(c.cssClass)!==""){d.addClass(c.cssClass)}else{d.addClass("btn-default")}if(typeof c.hotkey!=="undefined"){this.registeredButtonHotkeys[c.hotkey]=d}d.on("click",{dialog:this,$button:d,button:c},function(g){var f=g.data.dialog;var h=g.data.$button;var e=g.data.button;if(typeof e.action==="function"){e.action.call(h,f)}if(e.autospin){h.toggleSpin(true)}});this.enhanceButton(d);return d},enhanceButton:function(c){c.dialog=this;c.toggleEnable=function(d){var e=this;if(typeof d!=="undefined"){e.prop("disabled",!d).toggleClass("disabled",!d)}else{e.prop("disabled",!e.prop("disabled"))}return e};c.enable=function(){var d=this;d.toggleEnable(true);return d};c.disable=function(){var d=this;d.toggleEnable(false);return d};c.toggleSpin=function(g){var f=this;var e=f.dialog;var d=f.find("."+e.getNamespace("button-icon"));if(typeof g==="undefined"){g=!(c.find(".icon-spin").length>0)}if(g){d.hide();c.prepend(e.createButtonIcon(e.getSpinicon()).addClass("icon-spin"))}else{d.show();c.find(".icon-spin").remove()}return f};c.spin=function(){var d=this;d.toggleSpin(true);return d};c.stopSpin=function(){var d=this;d.toggleSpin(false);return d};return this},createButtonIcon:function(d){var c=b("<span></span>");c.addClass(this.getNamespace("button-icon")).addClass(d);return c},enableButtons:function(c){b.each(this.indexedButtons,function(e,d){d.toggleEnable(c)});return this},updateClosable:function(){if(this.isRealized()){this.getModalHeader().find("."+this.getNamespace("close-button")).toggle(this.isClosable())}return this},onShow:function(c){this.options.onshow=c;return this},onShown:function(c){this.options.onshown=c;return this},onHide:function(c){this.options.onhide=c;return this},onHidden:function(c){this.options.onhidden=c;return this},isRealized:function(){return this.realized},setRealized:function(c){this.realized=c;return this},isOpened:function(){return this.opened},setOpened:function(c){this.opened=c;return this},handleModalEvents:function(){this.getModal().on("show.bs.modal",{dialog:this},function(d){var c=d.data.dialog;if(typeof c.options.onshow==="function"){return c.options.onshow(c)}});this.getModal().on("shown.bs.modal",{dialog:this},function(d){var c=d.data.dialog;typeof c.options.onshown==="function"&&c.options.onshown(c)});this.getModal().on("hide.bs.modal",{dialog:this},function(d){var c=d.data.dialog;if(typeof c.options.onhide==="function"){return c.options.onhide(c)}});this.getModal().on("hidden.bs.modal",{dialog:this},function(d){var c=d.data.dialog;typeof c.options.onhidden==="function"&&c.options.onhidden(c);c.isAutodestroy()&&b(this).remove()});this.getModal().on("mouseup",{dialog:this},function(c){c.target===this&&c.data.dialog.isClosable()&&c.data.dialog.canCloseByBackdrop()&&c.data.dialog.close()});this.getModal().on("keyup",{dialog:this},function(c){c.which===27&&c.data.dialog.isClosable()&&c.data.dialog.canCloseByKeyboard()&&c.data.dialog.close()});this.getModal().on("keyup",{dialog:this},function(d){var c=d.data.dialog;if(typeof c.registeredButtonHotkeys[d.which]!=="undefined"){var e=b(c.registeredButtonHotkeys[d.which]);!e.prop("disabled")&&e.focus().trigger("click")}});return this},makeModalDraggable:function(){if(this.options.draggable){this.getModalHeader().addClass(this.getNamespace("draggable")).on("mousedown",{dialog:this},function(e){var d=e.data.dialog;d.draggableData.isMouseDown=true;var c=d.getModalContent().offset();d.draggableData.mouseOffset={top:e.clientY-c.top,left:e.clientX-c.left}});this.getModal().on("mouseup 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this},realize:function(){this.initModalStuff();this.getModal().addClass(a.NAMESPACE).addClass(this.getSize()).addClass(this.getCssClass());this.getModalFooter().append(this.createFooterContent());this.getModalHeader().append(this.createHeaderContent());this.getModalBody().append(this.createBodyContent());this.getModal().modal({backdrop:"static",keyboard:false,show:false});this.makeModalDraggable();this.handleModalEvents();this.setRealized(true);this.updateButtons();this.updateType();this.updateTitle();this.updateMessage();this.updateClosable();this.updateAnimate();return this},open:function(){!this.isRealized()&&this.realize();this.getModal().modal("show");this.updateZIndex();this.setOpened(true);return this},close:function(){this.getModal().modal("hide");if(this.isAutodestroy()){delete a.dialogs[this.getId()]}this.setOpened(false);a.moveFocus();a.showScrollbar();return this}};a.newGuid=function(){return"xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx".replace(/[xy]/g,function(f){var e=Math.random()*16|0,d=f==="x"?e:(e&3|8);return d.toString(16)})};a.show=function(c){return new a(c).open()};a.alert=function(){var d={};var c={type:a.TYPE_PRIMARY,title:null,message:null,closable:true,buttonLabel:"OK",callback:null};if(typeof arguments[0]==="object"&&arguments[0].constructor==={}.constructor){d=b.extend(true,c,arguments[0])}else{d=b.extend(true,c,{message:arguments[0],closable:false,buttonLabel:"OK",callback:typeof arguments[1]!=="undefined"?arguments[1]:null})}return new a({type:d.type,title:d.title,message:d.message,closable:d.closable,data:{callback:d.callback},onhide:function(e){!e.getData("btnClicked")&&e.isClosable()&&typeof e.getData("callback")==="function"&&e.getData("callback")(false)},buttons:[{label:d.buttonLabel,action:function(e){e.setData("btnClicked",true);typeof e.getData("callback")==="function"&&e.getData("callback")(true);e.close()}}]}).open()};a.confirm=function(c,d){return new a({title:"Confirmation",message:c,closable:false,data:{callback:d},buttons:[{label:"Cancel",action:function(e){typeof e.getData("callback")==="function"&&e.getData("callback")(false);e.close()}},{label:"OK",cssClass:"btn-primary",action:function(e){typeof e.getData("callback")==="function"&&e.getData("callback")(true);e.close()}}]}).open()};a.warning=function(c,d){return new a({type:a.TYPE_WARNING,message:c}).open()};a.danger=function(c,d){return new a({type:a.TYPE_DANGER,message:c}).open()};a.success=function(c,d){return new a({type:a.TYPE_SUCCESS,message:c}).open()};return a}));
\ No newline at end of file
+(function(a,b){if(typeof module!=="undefined"&&module.exports){module.exports=b(require("jquery"),require("bootstrap"))}else{if(typeof define==="function"&&define.amd){define("bootstrap-dialog",["jquery","bootstrap"],function(c){return b(c)})}else{a.BootstrapDialog=b(a.jQuery)}}}(this,function(d){var b=d.fn.modal.Constructor;var c=function(f,e){if(/4\.1\.\d+/.test(d.fn.modal.Constructor.VERSION)){return new b(f,e)}else{b.call(this,f,e)}};c.getModalVersion=function(){var e=null;if(typeof d.fn.modal.Constructor.VERSION==="undefined"){e="v3.1"}else{if(/3\.2\.\d+/.test(d.fn.modal.Constructor.VERSION)){e="v3.2"}else{if(/3\.3\.[1,2]/.test(d.fn.modal.Constructor.VERSION)){e="v3.3"}else{if(/4\.\d\.\d+/.test(d.fn.modal.Constructor.VERSION)){e="v4.1"}else{e="v3.3.4"}}}}return e};c.ORIGINAL_BODY_PADDING=parseInt((d("body").css("padding-right")||0),10);c.METHODS_TO_OVERRIDE={};c.METHODS_TO_OVERRIDE["v3.1"]={};c.METHODS_TO_OVERRIDE["v3.2"]={hide:function(g){if(g){g.preventDefault()}g=d.Event("hide.bs.modal");this.$element.trigger(g);if(!this.isShown||g.isDefaultPrevented()){return}this.isShown=false;var f=this.getGlobalOpenedDialogs();if(f.length===0){this.$body.removeClass("modal-open")}this.resetScrollbar();this.escape();d(document).off("focusin.bs.modal");this.$element.removeClass("in").attr("aria-hidden",true).off("click.dismiss.bs.modal");d.support.transition&&this.$element.hasClass("fade")?this.$element.one("bsTransitionEnd",d.proxy(this.hideModal,this)).emulateTransitionEnd(300):this.hideModal()}};c.METHODS_TO_OVERRIDE["v3.3"]={setScrollbar:function(){var e=c.ORIGINAL_BODY_PADDING;if(this.bodyIsOverflowing){this.$body.css("padding-right",e+this.scrollbarWidth)}},resetScrollbar:function(){var e=this.getGlobalOpenedDialogs();if(e.length===0){this.$body.css("padding-right",c.ORIGINAL_BODY_PADDING)}},hideModal:function(){this.$element.hide();this.backdrop(d.proxy(function(){var e=this.getGlobalOpenedDialogs();if(e.length===0){this.$body.removeClass("modal-open")}this.resetAdjustments();this.resetScrollbar();this.$element.trigger("hidden.bs.modal")},this))}};c.METHODS_TO_OVERRIDE["v3.3.4"]=d.extend({},c.METHODS_TO_OVERRIDE["v3.3"]);c.METHODS_TO_OVERRIDE["v4.1"]=d.extend({},c.METHODS_TO_OVERRIDE["v3.3"]);c.prototype={constructor:c,getGlobalOpenedDialogs:function(){var e=[];d.each(a.dialogs,function(g,f){if(f.isRealized()&&f.isOpened()){e.push(f)}});return e}};c.prototype=d.extend(c.prototype,b.prototype,c.METHODS_TO_OVERRIDE[c.getModalVersion()]);var a=function(e){this.defaultOptions=d.extend(true,{id:a.newGuid(),buttons:[],data:{},onshow:null,onshown:null,onhide:null,onhidden:null},a.defaultOptions);this.indexedButtons={};this.registeredButtonHotkeys={};this.draggableData={isMouseDown:false,mouseOffset:{}};this.realized=false;this.opened=false;this.initOptions(e);this.holdThisInstance()};a.BootstrapDialogModal=c;a.NAMESPACE="bootstrap-dialog";a.TYPE_DEFAULT="type-default";a.TYPE_INFO="type-info";a.TYPE_PRIMARY="type-primary";a.TYPE_SECONDARY="type-secondary";a.TYPE_SUCCESS="type-success";a.TYPE_WARNING="type-warning";a.TYPE_DANGER="type-danger";a.TYPE_DARK="type-dark";a.TYPE_LIGHT="type-light";a.DEFAULT_TEXTS={};a.DEFAULT_TEXTS[a.TYPE_DEFAULT]="Default";a.DEFAULT_TEXTS[a.TYPE_INFO]="Information";a.DEFAULT_TEXTS[a.TYPE_PRIMARY]="Primary";a.DEFAULT_TEXTS[a.TYPE_SECONDARY]="Secondary";a.DEFAULT_TEXTS[a.TYPE_SUCCESS]="Success";a.DEFAULT_TEXTS[a.TYPE_WARNING]="Warning";a.DEFAULT_TEXTS[a.TYPE_DANGER]="Danger";a.DEFAULT_TEXTS[a.TYPE_DARK]="Dark";a.DEFAULT_TEXTS[a.TYPE_LIGHT]="Light";a.DEFAULT_TEXTS.OK="OK";a.DEFAULT_TEXTS.CANCEL="Cancel";a.DEFAULT_TEXTS.CONFIRM="Confirmation";a.SIZE_NORMAL="size-normal";a.SIZE_SMALL="size-small";a.SIZE_WIDE="size-wide";a.SIZE_EXTRAWIDE="size-extrawide";a.SIZE_LARGE="size-large";a.BUTTON_SIZES={};a.BUTTON_SIZES[a.SIZE_NORMAL]="";a.BUTTON_SIZES[a.SIZE_SMALL]="btn-small";a.BUTTON_SIZES[a.SIZE_WIDE]="btn-block";a.BUTTON_SIZES[a.SIZE_LARGE]="btn-lg";a.ICON_SPINNER="glyphicon glyphicon-asterisk";a.BUTTONS_ORDER_CANCEL_OK="btns-order-cancel-ok";a.BUTTONS_ORDER_OK_CANCEL="btns-order-ok-cancel";a.defaultOptions={type:a.TYPE_PRIMARY,size:a.SIZE_NORMAL,cssClass:"",title:null,message:null,nl2br:true,closable:true,closeByBackdrop:true,closeByKeyboard:true,closeIcon:"&#215;",spinicon:a.ICON_SPINNER,autodestroy:true,draggable:false,animate:true,description:"",tabindex:-1,btnsOrder:a.BUTTONS_ORDER_CANCEL_OK};a.configDefaultOptions=function(e){a.defaultOptions=d.extend(true,a.defaultOptions,e)};a.dialogs={};a.openAll=function(){d.each(a.dialogs,function(f,e){e.open()})};a.closeAll=function(){d.each(a.dialogs,function(f,e){e.close()})};a.getDialog=function(f){var e=null;if(typeof a.dialogs[f]!=="undefined"){e=a.dialogs[f]}return e};a.setDialog=function(e){a.dialogs[e.getId()]=e;return e};a.addDialog=function(e){return a.setDialog(e)};a.moveFocus=function(){var e=null;d.each(a.dialogs,function(g,f){if(f.isRealized()&&f.isOpened()){e=f}});if(e!==null){e.getModal().focus()}};a.METHODS_TO_OVERRIDE={};a.METHODS_TO_OVERRIDE["v3.1"]={handleModalBackdropEvent:function(){this.getModal().on("click",{dialog:this},function(e){e.target===this&&e.data.dialog.isClosable()&&e.data.dialog.canCloseByBackdrop()&&e.data.dialog.close()});return this},updateZIndex:function(){if(this.isOpened()){var g=1040;var h=1050;var i=0;d.each(a.dialogs,function(j,k){if(k.isRealized()&&k.isOpened()){i++}});var f=this.getModal();var e=this.getModalBackdrop(f);f.css("z-index",h+(i-1)*20);e.css("z-index",g+(i-1)*20)}return this},open:function(){!this.isRealized()&&this.realize();this.getModal().modal("show");this.updateZIndex();return this}};a.METHODS_TO_OVERRIDE["v3.2"]={handleModalBackdropEvent:a.METHODS_TO_OVERRIDE["v3.1"]["handleModalBackdropEvent"],updateZIndex:a.METHODS_TO_OVERRIDE["v3.1"]["updateZIndex"],open:a.METHODS_TO_OVERRIDE["v3.1"]["open"]};a.METHODS_TO_OVERRIDE["v3.3"]={};a.METHODS_TO_OVERRIDE["v3.3.4"]=d.extend({},a.METHODS_TO_OVERRIDE["v3.1"]);a.METHODS_TO_OVERRIDE["v4.0"]={getModalBackdrop:function(e){return d(e.data("bs.modal")._backdrop)},handleModalBackdropEvent:a.METHODS_TO_OVERRIDE["v3.1"]["handleModalBackdropEvent"],updateZIndex:a.METHODS_TO_OVERRIDE["v3.1"]["updateZIndex"],open:a.METHODS_TO_OVERRIDE["v3.1"]["open"],getModalForBootstrapDialogModal:function(){return this.getModal().get(0)}};a.METHODS_TO_OVERRIDE["v4.1"]={getModalBackdrop:function(e){return d(e.data("bs.modal")._backdrop)},handleModalBackdropEvent:a.METHODS_TO_OVERRIDE["v3.1"]["handleModalBackdropEvent"],updateZIndex:a.METHODS_TO_OVERRIDE["v3.1"]["updateZIndex"],open:a.METHODS_TO_OVERRIDE["v3.1"]["open"],getModalForBootstrapDialogModal:function(){return this.getModal().get(0)}};a.prototype={constructor:a,initOptions:function(e){this.options=d.extend(true,this.defaultOptions,e);return this},holdThisInstance:function(){a.addDialog(this);return this},initModalStuff:function(){this.setModal(this.createModal()).setModalDialog(this.createModalDialog()).setModalContent(this.createModalContent()).setModalHeader(this.createModalHeader()).setModalBody(this.createModalBody()).setModalFooter(this.createModalFooter());this.getModal().append(this.getModalDialog());this.getModalDialog().append(this.getModalContent());this.getModalContent().append(this.getModalHeader()).append(this.getModalBody()).append(this.getModalFooter());return this},createModal:function(){var e=d('<div class="modal" role="dialog" aria-hidden="true"></div>');e.prop("id",this.getId());e.attr("aria-labelledby",this.getId()+"_title");return e},getModal:function(){return this.$modal},setModal:function(e){this.$modal=e;return this},getModalBackdrop:function(e){return e.data("bs.modal").$backdrop},getModalForBootstrapDialogModal:function(){return this.getModal()},createModalDialog:function(){return d('<div class="modal-dialog"></div>')},getModalDialog:function(){return this.$modalDialog},setModalDialog:function(e){this.$modalDialog=e;return this},createModalContent:function(){return d('<div class="modal-content"></div>')},getModalContent:function(){return this.$modalContent},setModalContent:function(e){this.$modalContent=e;return this},createModalHeader:function(){return d('<div class="modal-header"></div>')},getModalHeader:function(){return this.$modalHeader},setModalHeader:function(e){this.$modalHeader=e;return this},createModalBody:function(){return d('<div class="modal-body"></div>')},getModalBody:function(){return this.$modalBody},setModalBody:function(e){this.$modalBody=e;return this},createModalFooter:function(){return d('<div class="modal-footer"></div>')},getModalFooter:function(){return this.$modalFooter},setModalFooter:function(e){this.$modalFooter=e;return this},createDynamicContent:function(f){var e=null;if(typeof f==="function"){e=f.call(f,this)}else{e=f}if(typeof e==="string"){e=this.formatStringContent(e)}return e},formatStringContent:function(e){if(this.options.nl2br){return e.replace(/\r\n/g,"<br />").replace(/[\r\n]/g,"<br />")}return e},setData:function(e,f){this.options.data[e]=f;return this},getData:function(e){return this.options.data[e]},setId:function(e){this.options.id=e;return this},getId:function(){return this.options.id},getType:function(){return this.options.type},setType:function(e){this.options.type=e;this.updateType();return this},updateType:function(){if(this.isRealized()){var e=[a.TYPE_DEFAULT,a.TYPE_INFO,a.TYPE_PRIMARY,a.TYPE_SECONDARY,a.TYPE_SUCCESS,a.TYPE_WARNING,a.TYPE_DARK,a.TYPE_LIGHT,a.TYPE_DANGER];this.getModal().removeClass(e.join(" ")).addClass(this.getType())}return this},getSize:function(){return this.options.size},setSize:function(e){this.options.size=e;this.updateSize();return this},updateSize:function(){if(this.isRealized()){var e=this;this.getModal().removeClass(a.SIZE_NORMAL).removeClass(a.SIZE_SMALL).removeClass(a.SIZE_WIDE).removeClass(a.SIZE_EXTRAWIDE).removeClass(a.SIZE_LARGE);this.getModal().addClass(this.getSize());this.getModalDialog().removeClass("modal-sm");if(this.getSize()===a.SIZE_SMALL){this.getModalDialog().addClass("modal-sm")}this.getModalDialog().removeClass("modal-lg");if(this.getSize()===a.SIZE_WIDE){this.getModalDialog().addClass("modal-lg")}this.getModalDialog().removeClass("modal-xl");if(this.getSize()===a.SIZE_EXTRAWIDE){this.getModalDialog().addClass("modal-xl")}d.each(this.options.buttons,function(g,i){var k=e.getButton(i.id);var f=["btn-lg","btn-sm","btn-xs"];var j=false;if(typeof i.cssClass==="string"){var h=i.cssClass.split(" ");d.each(h,function(l,m){if(d.inArray(m,f)!==-1){j=true}})}if(!j){k.removeClass(f.join(" "));k.addClass(e.getButtonSize())}})}return this},getCssClass:function(){return this.options.cssClass},setCssClass:function(e){this.options.cssClass=e;return this},getTitle:function(){return this.options.title},setTitle:function(e){this.options.title=e;this.updateTitle();return this},updateTitle:function(){if(this.isRealized()){var e=this.getTitle()!==null?this.createDynamicContent(this.getTitle()):this.getDefaultText();this.getModalHeader().find("."+this.getNamespace("title")).html("").append(e).prop("id",this.getId()+"_title")}return this},getMessage:function(){return this.options.message},setMessage:function(e){this.options.message=e;this.updateMessage();return this},updateMessage:function(){if(this.isRealized()){var e=this.createDynamicContent(this.getMessage());this.getModalBody().find("."+this.getNamespace("message")).html("").append(e)}return this},isClosable:function(){return this.options.closable},setClosable:function(e){this.options.closable=e;this.updateClosable();return this},setCloseByBackdrop:function(e){this.options.closeByBackdrop=e;return this},canCloseByBackdrop:function(){return this.options.closeByBackdrop},setCloseByKeyboard:function(e){this.options.closeByKeyboard=e;return this},canCloseByKeyboard:function(){return this.options.closeByKeyboard},isAnimate:function(){return this.options.animate},setAnimate:function(e){this.options.animate=e;return this},updateAnimate:function(){if(this.isRealized()){this.getModal().toggleClass("fade",this.isAnimate())}return this},getSpinicon:function(){return this.options.spinicon},setSpinicon:function(e){this.options.spinicon=e;return this},addButton:function(e){this.options.buttons.push(e);return this},addButtons:function(f){var e=this;d.each(f,function(g,h){e.addButton(h)});return this},getButtons:function(){return this.options.buttons},setButtons:function(e){this.options.buttons=e;this.updateButtons();return this},getButton:function(e){if(typeof this.indexedButtons[e]!=="undefined"){return this.indexedButtons[e]}return null},getButtonSize:function(){if(typeof a.BUTTON_SIZES[this.getSize()]!=="undefined"){return a.BUTTON_SIZES[this.getSize()]}return""},updateButtons:function(){if(this.isRealized()){if(this.getButtons().length===0){this.getModalFooter().hide()}else{this.getModalFooter().show().closest(".modal-footer").append(this.createFooterButtons())}}return this},isAutodestroy:function(){return this.options.autodestroy},setAutodestroy:function(e){this.options.autodestroy=e},getDescription:function(){return this.options.description},setDescription:function(e){this.options.description=e;return this},setTabindex:function(e){this.options.tabindex=e;return this},getTabindex:function(){return this.options.tabindex},updateTabindex:function(){if(this.isRealized()){this.getModal().attr("tabindex",this.getTabindex())}return this},getDefaultText:function(){return a.DEFAULT_TEXTS[this.getType()]},getNamespace:function(e){return a.NAMESPACE+"-"+e},createHeaderContent:function(){var e=d("<div></div>");e.addClass(this.getNamespace("header"));e.append(this.createTitleContent());e.append(this.createCloseButton());return e},createTitleContent:function(){var e=d("<div></div>");e.addClass(this.getNamespace("title"));return e},createCloseButton:function(){var f=d("<div></div>");f.addClass(this.getNamespace("close-button"));var e=d('<button class="close" aria-label="close"></button>');e.append(this.options.closeIcon);f.append(e);f.on("click",{dialog:this},function(g){g.data.dialog.close()});return f},createBodyContent:function(){var e=d("<div></div>");e.addClass(this.getNamespace("body"));e.append(this.createMessageContent());return e},createMessageContent:function(){var e=d("<div></div>");e.addClass(this.getNamespace("message"));return e},createFooterContent:function(){var e=d("<div></div>");e.addClass(this.getNamespace("footer"));return e},createFooterButtons:function(){var e=this;var f=e.$modalFooter;this.indexedButtons={};d.each(this.options.buttons,function(g,h){if(!h.id){h.id=a.newGuid()}var i=e.createButton(h);e.indexedButtons[h.id]=i;f.append(i)});return f},createButton:function(e){var f=d('<button class="btn"></button>');f.prop("id",e.id);f.data("button",e);if(typeof e.icon!=="undefined"&&d.trim(e.icon)!==""){f.append(this.createButtonIcon(e.icon))}if(typeof e.label!=="undefined"){f.append(e.label)}if(typeof e.title!=="undefined"){f.attr("title",e.title)}if(typeof e.cssClass!=="undefined"&&d.trim(e.cssClass)!==""){f.addClass(e.cssClass)}else{f.addClass("btn-secondary")}if(typeof e.data==="object"&&e.data.constructor==={}.constructor){d.each(e.data,function(g,h){f.attr("data-"+g,h)})}if(typeof e.hotkey!=="undefined"){this.registeredButtonHotkeys[e.hotkey]=f}f.on("click",{dialog:this,$button:f,button:e},function(i){var h=i.data.dialog;var j=i.data.$button;var g=j.data("button");if(g.autospin){j.toggleSpin(true)}if(typeof g.action==="function"){return g.action.call(j,h,i)}});this.enhanceButton(f);if(typeof e.enabled!=="undefined"){f.toggleEnable(e.enabled)}f.addClass("bootstrap4-dialog-button");return f},enhanceButton:function(e){e.dialog=this;e.toggleEnable=function(f){var g=this;if(typeof f!=="undefined"){g.prop("disabled",!f).toggleClass("disabled",!f)}else{g.prop("disabled",!g.prop("disabled"))}return g};e.enable=function(){var f=this;f.toggleEnable(true);return f};e.disable=function(){var f=this;f.toggleEnable(false);return f};e.toggleSpin=function(i){var h=this;var g=h.dialog;var f=h.find("."+g.getNamespace("button-icon"));if(typeof i==="undefined"){i=!(e.find(".icon-spin").length>0)}if(i){f.hide();e.prepend(g.createButtonIcon(g.getSpinicon()).addClass("icon-spin"))}else{f.show();e.find(".icon-spin").remove()}return h};e.spin=function(){var f=this;f.toggleSpin(true);return f};e.stopSpin=function(){var f=this;f.toggleSpin(false);return f};return this},createButtonIcon:function(f){var e=d("<span></span>");e.addClass(this.getNamespace("button-icon")).addClass(f);return e},enableButtons:function(e){d.each(this.indexedButtons,function(g,f){f.toggleEnable(e)});return this},updateClosable:function(){if(this.isRealized()){this.getModalHeader().find("."+this.getNamespace("close-button")).toggle(this.isClosable())}return this},onShow:function(e){this.options.onshow=e;return this},onShown:function(e){this.options.onshown=e;return this},onHide:function(e){this.options.onhide=e;return this},onHidden:function(e){this.options.onhidden=e;return this},isRealized:function(){return this.realized},setRealized:function(e){this.realized=e;return this},isOpened:function(){return this.opened},setOpened:function(e){this.opened=e;return this},handleModalEvents:function(){this.getModal().on("show.bs.modal",{dialog:this},function(g){var f=g.data.dialog;f.setOpened(true);if(f.isModalEvent(g)&&typeof f.options.onshow==="function"){var e=f.options.onshow(f);if(e===false){f.setOpened(false)}return e}});this.getModal().on("shown.bs.modal",{dialog:this},function(f){var e=f.data.dialog;e.isModalEvent(f)&&typeof e.options.onshown==="function"&&e.options.onshown(e)});this.getModal().on("hide.bs.modal",{dialog:this},function(f){var e=f.data.dialog;e.setOpened(false);if(e.isModalEvent(f)&&typeof e.options.onhide==="function"){var g=e.options.onhide(e);if(g===false){e.setOpened(true)}return g}});this.getModal().on("hidden.bs.modal",{dialog:this},function(f){var e=f.data.dialog;e.isModalEvent(f)&&typeof e.options.onhidden==="function"&&e.options.onhidden(e);if(e.isAutodestroy()){e.setRealized(false);delete a.dialogs[e.getId()];d(this).remove()}a.moveFocus();if(d(".modal").hasClass("in")){d("body").addClass("modal-open")}});this.handleModalBackdropEvent();this.getModal().on("keyup",{dialog:this},function(e){e.which===27&&e.data.dialog.isClosable()&&e.data.dialog.canCloseByKeyboard()&&e.data.dialog.close()});this.getModal().on("keyup",{dialog:this},function(f){var e=f.data.dialog;if(typeof e.registeredButtonHotkeys[f.which]!=="undefined"){var g=d(e.registeredButtonHotkeys[f.which]);!g.prop("disabled")&&!g.is(":focus")&&g.focus().trigger("click")}});return this},handleModalBackdropEvent:function(){this.getModal().on("click",{dialog:this},function(e){d(e.target).hasClass("modal-backdrop")&&e.data.dialog.isClosable()&&e.data.dialog.canCloseByBackdrop()&&e.data.dialog.close()});return this},isModalEvent:function(e){return typeof e.namespace!=="undefined"&&e.namespace==="bs.modal"},makeModalDraggable:function(){if(this.options.draggable){this.getModalHeader().addClass(this.getNamespace("draggable")).on("mousedown",{dialog:this},function(g){var f=g.data.dialog;f.draggableData.isMouseDown=true;var e=f.getModalDialog().offset();f.draggableData.mouseOffset={top:g.clientY-e.top,left:g.clientX-e.left}});this.getModal().on("mouseup mouseleave",{dialog:this},function(e){e.data.dialog.draggableData.isMouseDown=false});d("body").on("mousemove",{dialog:this},function(f){var e=f.data.dialog;if(!e.draggableData.isMouseDown){return}e.getModalDialog().offset({top:f.clientY-e.draggableData.mouseOffset.top,left:f.clientX-e.draggableData.mouseOffset.left})})}return this},realize:function(){this.initModalStuff();this.getModal().addClass(a.NAMESPACE).addClass(this.getCssClass());this.updateSize();if(this.getDescription()){this.getModal().attr("aria-describedby",this.getDescription())}this.getModalHeader().append(this.createHeaderContent());this.getModalBody().append(this.createBodyContent());this.getModal().data("bs.modal",new c(this.getModalForBootstrapDialogModal(),{backdrop:"static",keyboard:false,show:false}));this.makeModalDraggable();this.handleModalEvents();this.setRealized(true);this.updateButtons();this.updateType();this.updateTitle();this.updateMessage();this.updateClosable();this.updateAnimate();this.updateSize();this.updateTabindex();return this},open:function(){!this.isRealized()&&this.realize();this.getModal().modal("show");return this},close:function(){!this.isRealized()&&this.realize();this.getModal().modal("hide");return this}};a.prototype=d.extend(a.prototype,a.METHODS_TO_OVERRIDE[c.getModalVersion()]);a.newGuid=function(){return"xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx".replace(/[xy]/g,function(g){var f=Math.random()*16|0,e=g==="x"?f:(f&3|8);return e.toString(16)})};a.show=function(e){return new a(e).open()};a.alert=function(){var g={};var e={type:a.TYPE_PRIMARY,title:null,message:null,closable:false,draggable:false,buttonLabel:a.DEFAULT_TEXTS.OK,buttonHotkey:null,callback:null};if(typeof arguments[0]==="object"&&arguments[0].constructor==={}.constructor){g=d.extend(true,e,arguments[0])}else{g=d.extend(true,e,{message:arguments[0],callback:typeof arguments[1]!=="undefined"?arguments[1]:null})}var f=new a(g);f.setData("callback",g.callback);f.addButton({label:g.buttonLabel,hotkey:g.buttonHotkey,action:function(h){if(typeof h.getData("callback")==="function"&&h.getData("callback").call(this,true)===false){return false}h.setData("btnClicked",true);return h.close()}});if(typeof f.options.onhide==="function"){f.onHide(function(h){var i=true;if(!h.getData("btnClicked")&&h.isClosable()&&typeof h.getData("callback")==="function"){i=h.getData("callback")(false)}if(i===false){return false}i=this.onhide(h);return i}.bind({onhide:f.options.onhide}))}else{f.onHide(function(h){var i=true;if(!h.getData("btnClicked")&&h.isClosable()&&typeof h.getData("callback")==="function"){i=h.getData("callback")(false)}return i})}return f.open()};a.confirm=function(){var g={};var h={type:a.TYPE_PRIMARY,title:null,message:null,closable:false,draggable:false,btnCancelLabel:a.DEFAULT_TEXTS.CANCEL,btnCancelClass:null,btnCancelHotkey:null,btnOKLabel:a.DEFAULT_TEXTS.OK,btnOKClass:null,btnOKHotkey:null,btnsOrder:a.defaultOptions.btnsOrder,callback:null};if(typeof arguments[0]==="object"&&arguments[0].constructor==={}.constructor){g=d.extend(true,h,arguments[0])}else{g=d.extend(true,h,{message:arguments[0],callback:typeof 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diff --git a/web/js/bootstrap.min.js b/web/js/bootstrap.min.js
index d2853a6..c4c0d1f 100644
--- a/web/js/bootstrap.min.js
+++ b/web/js/bootstrap.min.js
@@ -1,12 +1,7 @@
 /*!
- * Bootstrap v3.3.4 (http://getbootstrap.com)
- * Copyright 2011-2015 Twitter, Inc.
- * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
- */
-
-/*!
- * Generated using the Bootstrap Customizer (http://v3.bootcss.com/customize/?id=b20ac20703111d3719f9)
- * Config saved to config.json and https://gist.github.com/b20ac20703111d3719f9
- */
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+  * Bootstrap v4.3.1 (https://getbootstrap.com/)
+  * Copyright 2011-2019 The Bootstrap Authors (https://github.com/twbs/bootstrap/graphs/contributors)
+  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+  */
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+//# sourceMappingURL=bootstrap.min.js.map
\ No newline at end of file
diff --git a/web/js/popper.min.js b/web/js/popper.min.js
new file mode 100644
index 0000000..36c2aeb
--- /dev/null
+++ b/web/js/popper.min.js
@@ -0,0 +1,5 @@
+/*
+ Copyright (C) Federico Zivolo 2019
+ Distributed under the MIT License (license terms are at http://opensource.org/licenses/MIT).
+ */(function(e,t){'object'==typeof exports&&'undefined'!=typeof module?module.exports=t():'function'==typeof define&&define.amd?define(t):e.Popper=t()})(this,function(){'use strict';function e(e){return e&&'[object Function]'==={}.toString.call(e)}function t(e,t){if(1!==e.nodeType)return[];var o=e.ownerDocument.defaultView,n=o.getComputedStyle(e,null);return t?n[t]:n}function o(e){return'HTML'===e.nodeName?e:e.parentNode||e.host}function n(e){if(!e)return document.body;switch(e.nodeName){case'HTML':case'BODY':return e.ownerDocument.body;case'#document':return e.body;}var i=t(e),r=i.overflow,p=i.overflowX,s=i.overflowY;return /(auto|scroll|overlay)/.test(r+s+p)?e:n(o(e))}function r(e){return 11===e?pe:10===e?se:pe||se}function p(e){if(!e)return document.documentElement;for(var o=r(10)?document.body:null,n=e.offsetParent||null;n===o&&e.nextElementSibling;)n=(e=e.nextElementSibling).offsetParent;var i=n&&n.nodeName;return 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v=ee(Q(s[l]-u,v),0),e.arrowElement=i,e.offsets.arrow=(n={},le(n,m,$(v)),le(n,h,''),n),e},element:'[x-arrow]'},flip:{order:600,enabled:!0,fn:function(e,t){if(W(e.instance.modifiers,'inner'))return e;if(e.flipped&&e.placement===e.originalPlacement)return e;var o=v(e.instance.popper,e.instance.reference,t.padding,t.boundariesElement,e.positionFixed),n=e.placement.split('-')[0],i=T(n),r=e.placement.split('-')[1]||'',p=[];switch(t.behavior){case ge.FLIP:p=[n,i];break;case ge.CLOCKWISE:p=G(n);break;case ge.COUNTERCLOCKWISE:p=G(n,!0);break;default:p=t.behavior;}return p.forEach(function(s,d){if(n!==s||p.length===d+1)return e;n=e.placement.split('-')[0],i=T(n);var a=e.offsets.popper,l=e.offsets.reference,f=Z,m='left'===n&&f(a.right)>f(l.left)||'right'===n&&f(a.left)<f(l.right)||'top'===n&&f(a.bottom)>f(l.top)||'bottom'===n&&f(a.top)<f(l.bottom),h=f(a.left)<f(o.left),c=f(a.right)>f(o.right),g=f(a.top)<f(o.top),u=f(a.bottom)>f(o.bottom),b='left'===n&&h||'right'===n&&c||'top'===n&&g||'bottom'===n&&u,w=-1!==['top','bottom'].indexOf(n),y=!!t.flipVariations&&(w&&'start'===r&&h||w&&'end'===r&&c||!w&&'start'===r&&g||!w&&'end'===r&&u),E=!!t.flipVariationsByContent&&(w&&'start'===r&&c||w&&'end'===r&&h||!w&&'start'===r&&u||!w&&'end'===r&&g),v=y||E;(m||b||v)&&(e.flipped=!0,(m||b)&&(n=p[d+1]),v&&(r=z(r)),e.placement=n+(r?'-'+r:''),e.offsets.popper=fe({},e.offsets.popper,C(e.instance.popper,e.offsets.reference,e.placement)),e=P(e.instance.modifiers,e,'flip'))}),e},behavior:'flip',padding:5,boundariesElement:'viewport',flipVariations:!1,flipVariationsByContent:!1},inner:{order:700,enabled:!1,fn:function(e){var t=e.placement,o=t.split('-')[0],n=e.offsets,i=n.popper,r=n.reference,p=-1!==['left','right'].indexOf(o),s=-1===['top','left'].indexOf(o);return i[p?'left':'top']=r[o]-(s?i[p?'width':'height']:0),e.placement=T(t),e.offsets.popper=g(i),e}},hide:{order:800,enabled:!0,fn:function(e){if(!K(e.instance.modifiers,'hide','preventOverflow'))return e;var t=e.offsets.reference,o=D(e.instance.modifiers,function(e){return'preventOverflow'===e.name}).boundaries;if(t.bottom<o.top||t.left>o.right||t.top>o.bottom||t.right<o.left){if(!0===e.hide)return e;e.hide=!0,e.attributes['x-out-of-boundaries']=''}else{if(!1===e.hide)return e;e.hide=!1,e.attributes['x-out-of-boundaries']=!1}return e}},computeStyle:{order:850,enabled:!0,fn:function(e,t){var o=t.x,n=t.y,i=e.offsets.popper,r=D(e.instance.modifiers,function(e){return'applyStyle'===e.name}).gpuAcceleration;void 0!==r&&console.warn('WARNING: `gpuAcceleration` option moved to `computeStyle` modifier and will not be supported in future versions of Popper.js!');var s,d,a=void 0===r?t.gpuAcceleration:r,l=p(e.instance.popper),f=u(l),m={position:i.position},h=q(e,2>window.devicePixelRatio||!me),c='bottom'===o?'top':'bottom',g='right'===n?'left':'right',b=B('transform');if(d='bottom'==c?'HTML'===l.nodeName?-l.clientHeight+h.bottom:-f.height+h.bottom:h.top,s='right'==g?'HTML'===l.nodeName?-l.clientWidth+h.right:-f.width+h.right:h.left,a&&b)m[b]='translate3d('+s+'px, '+d+'px, 0)',m[c]=0,m[g]=0,m.willChange='transform';else{var w='bottom'==c?-1:1,y='right'==g?-1:1;m[c]=d*w,m[g]=s*y,m.willChange=c+', '+g}var E={"x-placement":e.placement};return e.attributes=fe({},E,e.attributes),e.styles=fe({},m,e.styles),e.arrowStyles=fe({},e.offsets.arrow,e.arrowStyles),e},gpuAcceleration:!0,x:'bottom',y:'right'},applyStyle:{order:900,enabled:!0,fn:function(e){return V(e.instance.popper,e.styles),j(e.instance.popper,e.attributes),e.arrowElement&&Object.keys(e.arrowStyles).length&&V(e.arrowElement,e.arrowStyles),e},onLoad:function(e,t,o,n,i){var r=L(i,t,e,o.positionFixed),p=O(o.placement,r,t,e,o.modifiers.flip.boundariesElement,o.modifiers.flip.padding);return t.setAttribute('x-placement',p),V(t,{position:o.positionFixed?'fixed':'absolute'}),o},gpuAcceleration:void 0}}},ue});
+//# sourceMappingURL=popper.min.js.map
diff --git a/web/js/uoj.js b/web/js/uoj.js
index 37a6437..345ad92 100644
--- a/web/js/uoj.js
+++ b/web/js/uoj.js
@@ -546,15 +546,15 @@ $.fn.long_table = function(data, cur_page, header_row, get_row_str, config) {
 		
 		var get_page_li = function(p, h) {
 			if (p == -1) {
-				return $('<li></li>').addClass('disabled').append($('<a></a>').append(h));
+				return $('<li class="page-item"></li>').addClass('disabled').append($('<a class="page-link"></a>').append(h));
 			}
 			
-			var li = $('<li></li>');
+			var li = $('<li class="page-item"></li>');
 			if (p == cur_page) {
 				li.addClass('active');
 			}
 			li.append(
-				$('<a></a>').attr('href', '#' + table_div.id).append(h).click(function(e) {
+				$('<a class="page-link"></a>').attr('href', '#' + table_div.id).append(h).click(function(e) {
 					if (config.prevent_focus_on_click) {
 						e.preventDefault();
 					}
@@ -565,7 +565,7 @@ $.fn.long_table = function(data, cur_page, header_row, get_row_str, config) {
 		};
 		
 		if (n_pages > 1) {
-			var pagination = $('<ul class="pagination top-buffer-no bot-buffer-sm"></ul>');
+			var pagination = $('<ul class="pagination top-buffer-no bot-buffer-sm justify-content-center"></ul>');
 			if (cur_page > 1) {
 				pagination.append(get_page_li(cur_page - 1, '<span class="glyphicon glyphicon glyphicon-backward"></span>'));
 			} else {
@@ -701,7 +701,7 @@ $.fn.source_code_form_group = function(name, text, langs_options_html) {
 				.append(input_file)
 				.append($('<div class="input-group"/>')
 					.append(input_file_path)
-					.append($('<span class="input-group-btn"/>')
+					.append($('<span class="input-group-append"/>')
 						.append($('<button type="button" class="btn btn-primary">'+'<span class="glyphicon glyphicon-folder-open"></span> '+uojLocale('editor::browse')+'</button>')
 							.css('width', '100px')
 							.click(function() {
@@ -811,12 +811,13 @@ $.fn.source_code_form_group = function(name, text, langs_options_html) {
 		});
 
 		$(this)
+			.append($('<div class="row col-sm-12"/>')
 			.append($('<label class="col-sm-2 control-label"><div class="text-left">' + text + '</div></label>'))
 			.append($('<label class="col-sm-1 control-label" for="' + input_language_name + '">'+uojLocale('editor::language')+'</label>'))
 			.append($('<div class="col-sm-2"/>')
 				.append(input_language)
 			)
-			.append($('<div class="col-sm-offset-3 col-sm-2 radio"/>')
+			.append($('<div class="col-sm-2 offset-sm-3 radio"/>')
 				.append($('<label/>')
 					.append(input_upload_type_editor)
 					.append(' '+uojLocale('editor::upload by editor'))
@@ -827,7 +828,7 @@ $.fn.source_code_form_group = function(name, text, langs_options_html) {
 					.append(input_upload_type_file)
 					.append(' '+uojLocale('editor::upload from local'))
 				)
-			)
+			))
 			.append(div_help_language)
 			.append(div_editor)
 			.append(div_file);
@@ -880,7 +881,7 @@ $.fn.text_file_form_group = function(name, text) {
 				.append(input_file)
 				.append($('<div class="input-group"/>')
 					.append(input_file_path)
-					.append($('<span class="input-group-btn"/>')
+					.append($('<div class="input-group-append"/>')
 						.append($('<button type="button" class="btn btn-primary">'+'<span class="glyphicon glyphicon-folder-open"></span> '+uojLocale('editor::browse')+'</button>')
 							.css('width', '100px')
 							.click(function() {
@@ -968,9 +969,10 @@ $.fn.text_file_form_group = function(name, text) {
 		});
 
 		$(this)
+			.append($('<div class="row"/>')
 			.append($('<label class="col-sm-2 control-label"><div class="text-left">' + text + '</div></label>'))
 			.append($('<div class="top-buffer-sm" />'))
-			.append($('<div class="col-sm-offset-6 col-sm-2 radio"/>')
+			.append($('<div class="col-sm-2 offset-sm-6 radio"/>')
 				.append($('<label/>')
 					.append(input_upload_type_editor)
 					.append(' '+uojLocale('editor::upload by editor'))
@@ -981,7 +983,7 @@ $.fn.text_file_form_group = function(name, text) {
 					.append(input_upload_type_file)
 					.append(' '+uojLocale('editor::upload from local'))
 				)
-			)
+			))
 			.append(div_editor)
 			.append(div_file);
 
diff --git a/web/pictures/UOJ.ico b/web/pictures/UOJ.ico
deleted file mode 100644
index 2284934..0000000
Binary files a/web/pictures/UOJ.ico and /dev/null differ
diff --git a/web/pictures/UOJ.png b/web/pictures/UOJ.png
deleted file mode 100644
index cdaeddd..0000000
Binary files a/web/pictures/UOJ.png and /dev/null differ
diff --git a/web/pictures/UOJ_big.png b/web/pictures/UOJ_big.png
deleted file mode 100644
index 5b4b865..0000000
Binary files a/web/pictures/UOJ_big.png and /dev/null differ
diff --git a/web/pictures/UOJ_small.png b/web/pictures/UOJ_small.png
deleted file mode 100644
index 8063105..0000000
Binary files a/web/pictures/UOJ_small.png and /dev/null differ
diff --git a/web/pictures/lang/cn.png b/web/pictures/lang/cn.png
deleted file mode 100644
index 4836b0f..0000000
Binary files a/web/pictures/lang/cn.png and /dev/null differ
diff --git a/web/pictures/lang/gb.png b/web/pictures/lang/gb.png
deleted file mode 100644
index 51a27cf..0000000
Binary files a/web/pictures/lang/gb.png and /dev/null differ