diff --git a/web/app/views/main-nav.php b/web/app/views/main-nav.php
index 7e4b0ee..30c5c73 100644
--- a/web/app/views/main-nav.php
+++ b/web/app/views/main-nav.php
@@ -131,18 +131,6 @@ mb-4" role="navigation">
 			<?php if (isset($REQUIRE_LIB['bootstrap5'])): ?>
 			<hr class="d-lg-none text-muted">
 			<ul class="nav navbar-nav ms-md-auto">
-				<li class="nav-item">
-					<a class="nav-link" href="#" id="back-to-bs4">
-						<i class="bi bi-sign-turn-left"></i>
-						返回旧版
-					</a>
-					<script>
-						$('#back-to-bs4').click(function() {
-							$.cookie('bootstrap4', '1', { expires: 7, path: '/' });
-							location.reload();
-						});
-					</script>
-				</li>
 				<li class="nav-item dropdown">
 					<a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown" aria-expanded="false">
 						<i class="bi bi-translate"></i>
diff --git a/web/app/views/page-footer.php b/web/app/views/page-footer.php
index 2bfbd5e..03a132b 100644
--- a/web/app/views/page-footer.php
+++ b/web/app/views/page-footer.php
@@ -13,6 +13,14 @@
 								<a class="text-decoration-none" href="<?= HTML::url('/') ?>">S2OJ</a>
 								(build: <a class="text-decoration-none" href="https://github.com/renbaoshuo/S2OJ<?= UOJConfig::$data['profile']['s2oj-version'] == "dev" ? '' : '/tree/' . UOJConfig::$data['profile']['s2oj-version'] ?>"><?= UOJConfig::$data['profile']['s2oj-version'] ?></a>)
 								<?= UOJLocale::get('server time') ?>: <?= UOJTime::$time_now_str ?>
+								|
+								<a class="text-decoration-none" href="#" id="back-to-bs4">返回旧版</a>
+								<script>
+									$('#back-to-bs4').click(function() {
+										$.cookie('bootstrap4', '1', { expires: 7, path: '/' });
+										location.reload();
+									});
+								</script>
 							</p>
 							<p>
 								Based on