diff --git a/contest/quiz/templates/base.html b/contest/quiz/templates/base.html
index bfed189..712b8b5 100644
--- a/contest/quiz/templates/base.html
+++ b/contest/quiz/templates/base.html
@@ -148,8 +148,13 @@ <h1 class="text-3xl font-bold tracking-tight text-gray-900">{% current_page_titl
         {% endblock heading %}
       </header>
       {% block main %}
-        <main class="bg-fixed bg-center {% block main_bg_style %}{% endblock main_bg_style %}">
-          <div class="mx-auto max-w-2xl py-6 px-6 lg:px-8 {% block main_container_bg_style %}bg-gray-100/85 shadow{% endblock main_container_bg_style %}">
+        <main class="bg-fixed bg-center
+                     {% block main_bg_style %}
+                     {% endblock main_bg_style %}">
+          <div class="mx-auto max-w-2xl py-6 px-6 lg:px-8
+                      {% block main_container_bg_style %}
+                        bg-gray-100/85 shadow
+                      {% endblock main_container_bg_style %}">
             {% block content %}
             {% endblock content %}
           </div>
diff --git a/contest/quiz/templates/contest_review.html b/contest/quiz/templates/contest_review.html
index 27412cd..006027e 100644
--- a/contest/quiz/templates/contest_review.html
+++ b/contest/quiz/templates/contest_review.html
@@ -1,7 +1,10 @@
 {% extends "base.html" %}
 {% load my_humanize humanize %}
-{% block main_bg_style %}bg-img-contest{% endblock main_bg_style %}
-{% block main_container_bg_style %}{% endblock main_container_bg_style %}
+{% block main_bg_style %}
+  bg-img-contest
+{% endblock main_bg_style %}
+{% block main_container_bg_style %}
+{% endblock main_container_bg_style %}
 {% block content %}
   <aside class="my-4 -mx-6 lg:-mx-8 p-4 sm:px-6 lg:px-8 bg-white shadow">
     <p class="prose">提交时刻：{{ response.submit_at }}（{{ response.submit_at | naturaltime }}）。</p>
diff --git a/contest/quiz/templates/info.html b/contest/quiz/templates/info.html
index 09fa71a..13b29c8 100644
--- a/contest/quiz/templates/info.html
+++ b/contest/quiz/templates/info.html
@@ -5,7 +5,9 @@
   <script type='module' src="{% static 'js/dist/index_and_info.js' %}"></script>
   {{ status | json_script:"data:status" }}
 {% endblock scripts %}
-{% block main_bg_style %}bg-img-info{% endblock main_bg_style %}
+{% block main_bg_style %}
+  bg-img-info
+{% endblock main_bg_style %}
 {% block content %}
   <div class="prose mb-4 prose-a:no-underline">
     <h2>成绩</h2>