* { margin: 0; padding: 0; box-sizing: border-box;
      -webkit-tap-highlight-color: transparent;
      -webkit-touch-callout: none;
      -webkit-user-select: none;
      user-select: none;
      outline: none;
  }
  html, body {
    width: 100%; height: 100%;
    background: #000;
    overflow: hidden;
    touch-action: none;
    -webkit-text-size-adjust: none;
  }
  canvas {
    display: block;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
    -webkit-tap-highlight-color: transparent;
  }