chrome/browser/resources/chromeos/bluetooth_pair_device.css

/* Copyright (c) 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. */

.close-button {
  display: none;
}

#bluetooth-pairing {
  border: 0;
  box-shadow: none;
}

.overlay .page h1 {
  display: none;
}