html, body {
  margin: 0;
  padding: 0;
  background: radial-gradient(circle at 20% 10%, #ffd6f6 0%, #c9e7ff 40%, #ffffff 100%);
  font-family: 'Comic Sans MS', cursive, system-ui, -apple-system, Segoe UI;
  overflow: hidden;
  height: 100%;
  touch-action: none;               /* <-- key */
  -webkit-user-select: none;
  user-select: none;
}

canvas, video {
  display: block;
  touch-action: none;               /* <-- key */
  -webkit-user-select: none;
  user-select: none;
}