chromium/chrome/test/data/cast/cast_mirroring_performance_browsertest.css

/* Copyright 2020 The Chromium Authors
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
body {
  background-color: #ffffff;
  margin: 0;
  padding: 0;
}

div.help,
canvas {
  position: absolute;
  top: 0vh;
  border: none;
  margin: none;
  padding: none;
}

div.help {
  left: 0vw;
}

canvas {
  left: 22vw;
  width: 56vw;
  height: 100vh;
  image-rendering: pixelated;
}