html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: #000;
  overflow: hidden;
  overscroll-behavior: none;
  position: fixed;          /* stops iOS Safari rubber-banding */
  inset: 0;
}

#screen {
  display: block;
  width: 100vw;
  height: 100vh;
  height: 100dvh;           /* mobile address-bar-aware viewport */
  cursor: crosshair;
  image-rendering: crisp-edges;
  image-rendering: pixelated;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}

.noscript {
  color: #d8262c;
  font-family: monospace;
  text-align: center;
  margin-top: 40vh;
}