Fixes #34 issues with scrolling menu on definition page

node/src/documents/introduction/definitions.html

@@ -28,7 +28,7 @@ type   : 'UI Introduction'
 
   <p>Definitions in semantic are groups of css, fonts, images, and javascript which make up a single element. Unlike other javascript libraries, semantic UI elements are stand-alone and only require their own assets to function correctly.</p>
 
-  <h2 class="ui header">Definition Types</h2>
+  <h3 class="ui header">Definition Types</h3>
   <p>Semantic has five different ui definitions. These are useful patterns for describing re-usable parts of a website.</p>
   <table class="ui celled table segment">
     <tr>
@@ -140,7 +140,7 @@ type   : 'UI Introduction'
     <li>Product List</li>
   </ul>
 
-  <h2 class="ui header">Authoring UI</h2>
+  <h2 class="ui dividing header">Authoring UI</h2>
 
   <p><b>All UI</b>: The specification defines class name and html structures which can be used to represent an element
 </p>