Update index.html

public/index.html

@@ -8,7 +8,7 @@
     ul {
       list-style-type: none;
       padding: 0;
-      margin: 0;
+      margin: 1;
     }
 
     .button {
@@ -44,4 +44,4 @@
     <li><a class="button" href="X3DOMTutorial/">X3DOM Tutorial</a></li>
 </body>
 
-</html>
\ No newline at end of file
+</html>