diff --git a/index.html b/index.html
index 78758be..598bede 100644
--- a/index.html
+++ b/index.html
@@ -10,11 +10,13 @@
     <title>Nullable</title>
   </head>
   <body>
-    <header>
+    <div id="container">
+      <header>
 
-    </header>
-    <footer>
+      </header>
+      <footer>
 
-    </footer>
+      </footer>
+    </div>
   </body>
 </html>
