diff --git a/templates/bootstrap/main.html b/templates/bootstrap/main.html
index 138aa15..6d4a799 100644
--- a/templates/bootstrap/main.html
+++ b/templates/bootstrap/main.html
@@ -12,9 +12,9 @@
         <div class="col-lg-2 col-md-3 col-sm-4 col-xs-4">
             <div class="panel panel-default" style="height: 70px;">
                 <div class="panel-heading">
-                    <h3 class="panel-title">
+                    <h2 class="panel-title">
                         <a href="{{=entry.navlink}}" style="display: block;">{{=htmlspecialchars (entry.title)}}</a>
-                    </h3>
+                    </h2>
                 </div>
                 <div class="panel-body">
                     <span class="badge bottomright">{{=entry.number}}</span>
@@ -25,7 +25,7 @@
         <div class="col-lg-2 col-md-3 col-sm-4 col-xs-6">
         <div class="panel panel-default" style="height: 320px;">
           <div class="panel-heading">
-            <h3 class="panel-title"><a href="{{=str_format (it.c.url.detailUrl, entry.book.id, it.databaseId)}}">{{=htmlspecialchars (entry.title)}}</a></h3>
+            <h2 class="panel-title"><a href="{{=str_format (it.c.url.detailUrl, entry.book.id, it.databaseId)}}">{{=htmlspecialchars (entry.title)}}</a></h2>
           </div>
           <div class="panel-body">
             {{? entry.book.hasCover == 1}}