fixed span sum to 10 to display properly. Grid has 12 columns.

examples/container-app.html

@@ -49,7 +49,7 @@
       }
 
       /* Styles you shouldn't keep as they are for displaying this base example only */
-      .content .span10,
+      .content .span6,
       .content .span4 {
         min-height: 500px;
       }
@@ -100,7 +100,7 @@
           <h1>Page name <small>Supporting text or tagline</small></h1>
         </div>
         <div class="row">
-          <div class="span10">
+          <div class="span6">
             <h2>Main content</h2>
           </div>
           <div class="span4">