Cleaning up apps codelab

chrome/common/extensions/docs/static/css/site.css

 /* Copyright (c) 2012 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 .hidden {
   display: none;
 }
 
 body {
@@ skipping 543 matching lines @@
 }
 
 .imaged li img {
   float: right;
   margin-bottom: 1em;
 }
 
 .imaged + p {
   clear: right;
 }
+
+/* Tabbed pane with header (tabs) and content */
+tabs {
+  margin: 25px 0;
+  display: block;
+}
+tabs header {
+  display: inline-block;
+  padding: 10px;
+  border: 1px solid #ccc;
+  margin-bottom: 0;
+  background: inherit;
+  border-bottom: 1px solid white;
+  cursor: auto;
+}
+tabs header.unselected {
+  border-bottom: 1px solid #ccc;
+  background: #eee;
+  cursor: pointer;
+}
+tabs content {
+  display: block;
+  padding: 20px;
+  border: 1px solid #ccc;
+  margin-top: -1px;
+}
+tabs content.unselected {
+  display: none;
+}
+tabs content pre {
+  margin: 0;
+  padding: 10px;
+}