Improving layout and a11y for HID detection OOBE screen.

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

 /* Copyright 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.
  */
 
 #hid-detection {
   min-height: 395px;
   padding: 70px 17px 21px;
   width: 622px;
 }
@@ skipping 34 matching lines @@
   display: inline;
 }
 
 #hid-detection .label,
 #hid-keyboard-pincode {
   display: none;
 }
 
 #hid-keyboard-tick,
 #hid-mouse-tick {
-  left: -20px;
+  -webkit-margin-start: -28px;
+  bottom: -20px;
   position: relative;
   visibility: hidden;
 }
 
 .searching {
   opacity: 0.6
 }
 
+#hid-detection #hid-keyboard-pincode {
+  padding: 10px 0 20px 40px;
+}
+
 .searching #hid-keyboard-label-searching,
 .searching #hid-mouse-label-searching,
 .connected #hid-keyboard-label-connected,
 .connected #hid-mouse-label-connected,
 .paired #hid-keyboard-label-paired,
 .paired #hid-mouse-label-paired,
 .pairing #hid-keyboard-label-pairing,
 .connected #hid-keyboard-tick,
 .connected #hid-mouse-tick,
 .paired #hid-keyboard-tick,
 .paired #hid-mouse-tick {
   display: inline;
 }
 
 .connected #hid-keyboard-tick,
 .connected #hid-mouse-tick,
 .paired #hid-keyboard-tick,
 .paired #hid-mouse-tick {
   visibility: visible;
 }
 
 .pairing #hid-keyboard-pincode {
   display: block;
   margin-left: 40px;
   padding: 15px 0;
 }