html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: #000;
  overflow: hidden;
  /* Everything is drawn on the canvas; this font is only a fallback. */
  font-family: "SF Mono", "Menlo", "Consolas", monospace;
}

#screen {
  display: block;
  width: 100vw;
  height: 100vh;
  touch-action: none;
  cursor: none;
}