html, body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  height: 100%;
  width: 100%;
}

canvas {
  display: block;
  position: fixed;
  top: 0;
  left: 0;
  z-index: -1;
}

* {
  touch-action: manipulation;
  user-select: none;
}