chrome/browser/resources/inline_login/inline_login.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.
 */

html,
body,
#contents,
#signin-frame {
  height: 100%;
  margin: 0;
  overflow: hidden;
  padding: 0;
  width: 100%;
}

#signin-frame,
#spinner-container {
  bottom: 0;
  left: 0;
  position: absolute;
  right: 0;
  top: 0;
}

#spinner-container {
  -webkit-box-align: center;
  -webkit-box-pack: center;
  display: -webkit-box;
}

#contents.loading #signin-frame,
#contents:not(.loading) #spinner-container {
  display: none;
}