front_end/ui/rootView.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.
 */

.root-view {
  background-color: white;
  overflow: hidden;
  position: absolute !important;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
}