ChromeOS OOBE: update MD-OOBE after UI review.

chrome/browser/resources/chromeos/login/oobe_a11y_option.css

 /* Copyright 2016 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. */
 
 :host {
   background-color: white;
   display: flex;
   width: 100%;
 }
 
 #elementBox {
+  padding: 0 10px;
   width: inherit;
 }
 
 paper-toggle-button {
+  /* paper-toggle-button has fixed width of 36px. Make it 32. */
+  -webkit-transform: scale(.8888);
   min-height: 20px;
-  min-width: 36px;
+  min-width: 32px;
 }
 
 #titleContainer {
   color: rgba(0, 0, 0, 0.87);
   font: 13px Roboto, sans-serif;
 }
 
 .display-value {
   color: rgba(0, 0, 0, 0.54);
   font: 13px Roboto, sans-serif;
 }