diff --git a/web/app/controllers/problem.php b/web/app/controllers/problem.php
index 88c8acb..0bb6425 100644
--- a/web/app/controllers/problem.php
+++ b/web/app/controllers/problem.php
@@ -406,11 +406,11 @@ if (UOJContest::cur()) {
 					<span>标签</span>
 					<span>
 						<?php foreach (UOJProblem::cur()->queryTags() as $tag) : ?>
-							<a class="uoj-problem-tag">
-								<span class="badge bg-secondary">
-									<?= HTML::escape($tag) ?>
-								</span>
-							</a>
+							<?= HTML::tag(
+								'a',
+								['class' => 'uoj-problem-tag'],
+								HTML::tag('span', ['class' => 'badge bg-secondary'], HTML::escape($tag))
+							) ?>
 						<?php endforeach ?>
 					</span>
 				</li>
diff --git a/web/app/controllers/problem_solutions.php b/web/app/controllers/problem_solutions.php
index 66c69fc..71ef636 100644
--- a/web/app/controllers/problem_solutions.php
+++ b/web/app/controllers/problem_solutions.php
@@ -269,11 +269,11 @@ $pag = new Paginator($pag_config);
 					<span>标签</span>
 					<span>
 						<?php foreach (UOJProblem::cur()->queryTags() as $tag) : ?>
-							<a class="uoj-problem-tag">
-								<span class="badge bg-secondary">
-									<?= HTML::escape($tag) ?>
-								</span>
-							</a>
+							<?= HTML::tag(
+								'a',
+								['class' => 'uoj-problem-tag'],
+								HTML::tag('span', ['class' => 'badge bg-secondary'], HTML::escape($tag))
+							) ?>
 						<?php endforeach ?>
 					</span>
 				</li>
diff --git a/web/app/controllers/problem_statistics.php b/web/app/controllers/problem_statistics.php
index 8e9844e..d87c49b 100644
--- a/web/app/controllers/problem_statistics.php
+++ b/web/app/controllers/problem_statistics.php
@@ -341,11 +341,11 @@ $submissions_sort_by_choice = !isset($_COOKIE['submissions-sort-by-code-length']
 					<span>标签</span>
 					<span>
 						<?php foreach (UOJProblem::cur()->queryTags() as $tag) : ?>
-							<a class="uoj-problem-tag">
-								<span class="badge bg-secondary">
-									<?= HTML::escape($tag) ?>
-								</span>
-							</a>
+							<?= HTML::tag(
+								'a',
+								['class' => 'uoj-problem-tag'],
+								HTML::tag('span', ['class' => 'badge bg-secondary'], HTML::escape($tag))
+							) ?>
 						<?php endforeach ?>
 					</span>
 				</li>