diff --git a/12/index.html b/12/index.html
index 7b33668..7efc59e 100644
--- a/12/index.html
+++ b/12/index.html
@@ -10,8 +10,8 @@
   "https://fonts.googleapis.com/css?family=Roboto Mono">
 </head>
 <body>
-  <div class="back">
-    <a href="https://issue.xpub.nl/">↰ Main Page</a>
+  <div class="back>
+    <a id="main_page_link"href="https://issue.xpub.nl/">↰ Main Page</a>
   </div>
   <div class="intro">
     <div class="page_title_2">
