Update nav and add bounds for tablet container

docs/javascript.html

@@ -47,7 +47,7 @@
               <a href="./getting-started.html">Get started</a>
             </li>
             <li class="">
-              <a href="./css.html">Core CSS</a>
+              <a href="./css.html">CSS</a>
             </li>
             <li class="">
               <a href="./components.html">Components</a>