html, body {
  margin: 0;
}
#game-canvas {
  background: #333;
  width: 320px;
  margin-top: 20px;
}
#ui {
  position: absolute;
  bottom: 0;
  left: 0;
  background: #efefef;
}
#ui a {
  display: block;
  padding: 20px;
  text-decoration: none;
  color: #000;
}
#fps {
  position: fixed;
  left: 0;
  top: 20px;
  background: rgba(0, 0, 0, 0.8);
  color: #ffffff;
  padding: 5px;
  border-bottom-right-radius: 3px;
}