Center the desktop if it's smaller than the frame.

remoting/webapp/me2mom/toolbar.css

 /* Copyright (c) 2011 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.
  */
 
 .toolbar-container {
   position: fixed;
   top: -45px;
   width: 640px;
   left: 50%;
   margin-left: -320px;
   -webkit-transition: top 0.2s linear;
   -webkit-transition-delay: 0.7s;
   font-size: 13px;
   pointer-events: none;
+  z-index: 1;
 }
 
 .toolbar-container button {
   padding: 3px 9px;
 }
 
 .toolbar-container:hover, .toolbar-preview {
   top: -8px;
   -webkit-transition-delay: 0s;
 }
@@ skipping 41 matching lines @@
 
 .arrow-down {
   width: 0;
   height: 0;
   border-left: 5px solid transparent;
   border-right: 5px solid transparent;
   border-top: 5px solid white;
   left: auto;
   right: auto;
 }