chrome/browser/resources/gaia_auth/keyboard_ui.css

/* Copyright 2013 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.
 */

input[type=email]:focus,
input[type=number]:focus,
input[type=password]:focus,
input[type=tel]:focus,
input[type=text]:focus,
input[type=url]:focus {
  box-shadow: inset 0 1px 2px rgba(0,0,0,0.3),
              0 0 23px rgb(77, 144, 254)
              !important;
}

.g-button-submit:focus,
a:focus {
  box-shadow: inset 0 0 0 1px #fff,
              0 0 23px rgb(77, 144, 254)
              !important;
}