html, body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  position: fixed;
  width: 100%;
  height: 100dvh;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: none;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  background-color: #f5f5f5; /* Neutral off-white background */
}

canvas {
  display: block;
  /* Canvas dimensions are set in JavaScript */
  touch-action: none;
}