Clean up example page

Make the margins a bit more consistent.

@@ -42,12 +42,14 @@
   <style>
     body {
       font-family: Arial, sans-serif;
+      margin: 20px;
     }
     .info {
       background-color: #eee;
       border: thin solid #333;
       border-radius: 3px;
       padding: 0 5px;
+      margin: 20px 0;
     }
   </style>