html, body {
    margin: 0;
    padding: 0;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    background: #0f1020;
    font-family: 'Courier New', monospace;
    /* Stop double-click from dragging a native text-selection highlight
       across the canvas while picking colours. */
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
  }
  #game {
    display: block;
    width: 100vw;
    height: 100vh;
    outline: none;
    cursor: pointer;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
    -webkit-tap-highlight-color: transparent;
  }