html {
  background-color: aquamarine;
  overflow: hidden;
  height: 100%;
  background: #191919;
  width: 100%;
}

#canvas {
  background-image: url("space.jpg");
  width: 100%;
  height: 100%;
  background-size: cover;
}

#canvas.playing {
  cursor: url("https://marclopezavila.github.io/planet-defense-game/img/aim_red.png")
      17.5 17.5,
    auto !important;
}