* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  width: 100%;
  background: #000;
  overflow: hidden;
}

#stage {
  width: 100vw;
  height: 100vh;
}

#screen {
  display: block;
  width: 100vw;
  height: 100vh;
  /* Keep the upscaled low-res grid crisp instead of blurry. */
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  cursor: pointer;
  background: #000;
}