docs: add new iframe layout
diff --git a/docs/extensions.html b/docs/extensions.html
index d96445c..5d790fb 100644
--- a/docs/extensions.html
+++ b/docs/extensions.html
@@ -7,6 +7,13 @@
 </head>
 <body>
 
+<div class="header">
+  <h1>The Mesa 3D Graphics Library</h1>
+</div>
+
+<iframe src="contents.html"></iframe>
+<div class="content">
+
 <h1>Mesa Extensions</h1>
 
 <p>
@@ -31,5 +38,6 @@
 <li><a href="MESA_ycbcr_texture.spec">MESA_ycbcr_texture.spec</a>
 </ul>
 
+</div>
 </body>
 </html>