Fixing paste operation in File Browser

chrome/browser/resources/file_manager/css/file_manager.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.
  */
 
 /* Outer frame of the dialog. */
 body {
    -webkit-box-flex: 1;
    -webkit-box-orient: vertical;
@@ skipping 68 matching lines @@
   display: -webkit-box;
   padding-left: 1em;
   padding-right: 1em;
   padding-top: 2px;
   position: absolute;
   top: 1px;
 }
 
 .butter-bar.before-show {
   top: -30px;
+  opacity: 0;
+}
+
+.butter-bar.after-show {
+  top: 50px;
+  opacity: 0;
 }
 
 .butter-bar .content {
   padding-bottom: 8px;
   padding-right: 5px;
 }
 
 .hide-in-butter {
   display: none;
 }
@@ skipping 871 matching lines @@
   left: 0;
   width: 100%;
   height: 100%;
   border: none;
   z-index: 100;
 }
 
 menu.file-context-menu {
   z-index: 4;
 }