diff --git a/web/app/controllers/add_contest.php b/web/app/controllers/add_contest.php
index 72b7776..ae5b6a7 100644
--- a/web/app/controllers/add_contest.php
+++ b/web/app/controllers/add_contest.php
@@ -5,63 +5,66 @@ requirePHPLib('form');
 Auth::check() || redirectToLogin();
 UOJContest::userCanCreateContest(Auth::user()) || UOJResponse::page403();
 
-$time_form = new UOJBs4Form('time');
-$time_form->addVInput(
+$time_form = new UOJForm('time');
+$time_form->addInput(
 	'name',
-	'text',
-	'比赛标题',
-	'New Contest',
-	function ($name, &$vdata) {
-		if ($name == '') {
-			return '标题不能为空';
-		}
+	[
+		'label' => '比赛标题',
+		'default_value' => 'New Contest',
+		'validator_php' => function ($name, &$vdata) {
+			if ($name == '') {
+				return '标题不能为空';
+			}
 
-		if (strlen($name) > 100) {
-			return '标题过长';
-		}
+			if (strlen($name) > 100) {
+				return '标题过长';
+			}
 
-		$name = HTML::escape($name);
+			$name = HTML::escape($name);
 
-		if ($name === '') {
-			return '无效编码';
-		}
+			if ($name === '') {
+				return '无效编码';
+			}
 
-		$vdata['name'] = $name;
+			$vdata['name'] = $name;
 
-		return '';
-	},
-	null
+			return '';
+		},
+	]
 );
-$time_form->addVInput(
+$time_form->addInput(
 	'start_time',
-	'text',
-	'开始时间',
-	date("Y-m-d H:i:s"),
-	function ($str, &$vdata) {
-		try {
-			$vdata['start_time'] = new DateTime($str);
-		} catch (Exception $e) {
-			return '无效时间格式';
-		}
-		return '';
-	},
-	null
+	[
+		'div_class' => 'mt-2',
+		'label' => '开始时间',
+		'default_value' => date("Y-m-d H:i:s"),
+		'validator_php' => function ($str, &$vdata) {
+			try {
+				$vdata['start_time'] = new DateTime($str);
+			} catch (Exception $e) {
+				return '无效时间格式';
+			}
+
+			return '';
+		},
+	]
 );
-$time_form->addVInput(
+$time_form->addInput(
 	'last_min',
-	'text',
-	'时长（单位：分钟）',
-	180,
-	function ($str, &$vdata) {
-		if (!validateUInt($str)) {
-			return '必须为一个整数';
-		}
+	[
+		'div_class' => 'mt-2',
+		'label' => '时长（单位：分钟）',
+		'default_value' => '180',
+		'validator_php' => function ($str, &$vdata) {
+			if (!validateUInt($str)) {
+				return '必须为一个整数';
+			}
 
-		$vdata['last_min'] = $str;
+			$vdata['last_min'] = $str;
 
-		return '';
-	},
-	null
+			return '';
+		},
+	]
 );
 $time_form->handle = function (&$vdata) {
 	$start_time_str = $vdata['start_time']->format('Y-m-d H:i:s');
@@ -75,6 +78,7 @@ $time_form->handle = function (&$vdata) {
 $time_form->succ_href = "/contests";
 $time_form->runAtServer();
 ?>
+
 <?php echoUOJPageHeader('添加比赛') ?>
 
 <div class="row">
@@ -82,7 +86,6 @@ $time_form->runAtServer();
 	<div class="col-lg-9">
 		<div class="card card-default mb-2">
 			<div class="card-body">
-
 				<h1 class="card-title">添加比赛</h1>
 
 				<div class="w-full" style="max-width: 400px">