correct "classes" to "ids" for CSS hash-selectors

Author: dethe

index.html

@@ -1337,7 +1337,7 @@ <h2>Some Basic Interaction</h2>
     <article class='slide slide-list'>
       <h2>CSS id's</h2>
       <p>It's best practice to not have too many inline &lt;style&gt; attributes in a webpage. Remember that CSS is meant to help keep the presentation layer seperate from the content layer.</p>
-      <p>When you need to target certain containers, use the <code>id</code> attribute and put the CSS into the <code>&lt;style&gt;</code> tag. Use a <strong>hash</strong> to denote CSS selectors that are classes. e.g. <code>#centered_on_page</code></p>
+      <p>When you need to target certain containers, use the <code>id</code> attribute and put the CSS into the <code>&lt;style&gt;</code> tag. Use a <strong>hash</strong> to denote CSS selectors that are ids. e.g. <code>#centered_on_page</code></p>
       <p>You should only have one instance of an ID per page. Any more can cause errors in your page and CSS -- and even later, JavaScript.</p>
 <pre>
 &lt;div <strong>id="centered_on_page"</strong>&gt;Center me&lt;/div&gt;