body {
  background-color: #000;
  color: #fff;
  /* Allow mouse dragging. */
  -moz-user-select: none;
  -ms-user-select: none;
  -o-user-select: none;
  -webkit-user-select: none;
  user-select: none;  /* disable touch panning/zooming */
  -ms-touch-action: none;
  touch-action: none;
  /* Allow canvas to hit the edges of the browser viewport. */
  margin: 0;
}

#screen {
  position:relative;
}

#screen canvas {   margin: auto;  /* Hide the gap for font descenders. */   display: block;  /* disable scaling interpolation */
  image-rendering: optimizeSpeed;
  image-rendering: -moz-crisp-edges;
  image-rendering: -o-crisp-edges;
  image-rendering: -webkit-optimize-contrast;
  image-rendering: optimize-contrast;
  -ms-interpolation-mode: nearest-neighbor;
}