py/test/pytests/keyboard_static/keyboard.css

/*
 * Copyright 2017 The Chromium OS Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#keyboard-test-image {
  text-align: center;
  position: relative;
}

#keyboard-keys {
  position: absolute;
}

.keyboard-test-key {
  z-index: 2;
  opacity: 0.5;
  position: absolute;
}

.keyboard-test-key:before {
  content: "";
  display: inline-block;
  height: 100%;
  vertical-align: middle;
}

.keyboard-test-key.state-untested {
  background-color: white;
}

.keyboard-test-key.state-tested {
  background-color: green;
}

.keyboard-test-key.state-down {
  background-color: yellow;
}

.keyboard-test-key.state-skipped {
  background-color: gray;
}