html, body {
  margin: 0;
  padding: 0;
  background: #05060a;
  height: 100%;
  overflow: hidden;
}
#wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
}
#screen {
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  background: #000;
  /* display size is set by the game to an integer multiple of 400x240 */
}