Change color of ripple effects and tab focus of toolbar buttons in Files

ui/file_manager/file_manager/foreground/css/file_manager.css

 /* Copyright (c) 2014 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. */
 
 /* Special attribute used in HTML to hide elements. */
 body:not([type]) [visibleif] {
   display: none;
 }
 
 body[type='folder'] [invisibleif~='folder'],
@@ skipping 430 matching lines @@
 .dialog-header .ripples > paper-ripple {
   color: black;
 }
 
 body.check-select .dialog-header button paper-ripple {
   color: rgb(90, 90, 90);
 }
 
 .dialog-header
     button:focus:not(.using-mouse):not([tabindex='-1']):not(:active) {
-  background-color: rgba(90, 90, 90, 0.15);
+  background-color: rgba(255, 255, 255, 0.20);
 }
 
 body.check-select .dialog-header
     button:focus:not(.using-mouse):not([tabindex='-1']):not(:active) {
   background-color: rgba(153, 153, 153, 0.20);
 }
 
 .dialog-header iron-icon,
 .dialog-header .icon {
   height: 16px;
@@ skipping 1946 matching lines @@
 }
 
 #quick-view {
   z-index: 505; /* Must be above the scroll bar (500). */
 }
 
 /* Preventing FOUC */
 paper-input-container:unresolved {
   display: none;
 }