Make the stocks drawer look more realistic

sky/framework/sky-menu-divider.sky

 <!--
 // Copyright 2015 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.
 -->
-<import src="/sky/framework/sky-element.sky" />
+<import src="sky-element.sky" />
+
 <sky-element>
 <template>
   <style>
-    div {
-      height: 50px;
-      width: 50px;
-      background-color: green;
+    :host {
+      margin: 8px 0;
+      border-bottom: 1px solid rgba(0, 0, 0, 0.12);
     }
   </style>
-  <div>Hi</div>
 </template>
 <script>
-@Tagname('example')
-class ExampleElement extends SkyElement {
+import "dart:sky";
+
+@Tagname('sky-menu-divider')
+class SkyMenuDivider extends SkyElement {
 }
 
-_init(script) => register(script, ExampleElement);
+_init(script) => register(script, SkyMenuDivider);
 </script>
 </sky-element>