Powerwash UI polish

chrome/browser/resources/chromeos/login/oobe_text_button.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. */
 
 paper-button {
   border-color: var(--oobe-text-button-border-color, transparent);
   border-radius: 2px;
   border-style: solid;
   border-width: 2px;
   height: 32px; /* = 28px + 2 * 2px border */
@@ skipping 14 matching lines @@
   background-color: white
   color: var(--google-blue-500);
 }
 
 #textButton[inverse]:not([disabled]) #container {
   background-color: var(--google-blue-500);
   color: white;
 }
 
 #textButton[border]:not([disabled]) #container {
-  border-color: rgba(0, 0, 0, 0.2);
+  border-color: rgba(0, 0, 0, .1);
   border-style: solid;
   border-width: 1px;
 }
 
 ::content * {
   font: var(--oobe-roboto-medium), sans-serif;
   font-size: 12px;
   text-transform: none;
 }