* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  background: #000;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  min-height: -webkit-fill-available;
  overflow: hidden;
  touch-action: none;
}
canvas {
  display: block;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  touch-action: none;
}