html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
}

#holder {
  width: min(100vw, 150vh);
  height: min(66.6667vw, 100vh);
  background: #000;
}

canvas {
  display: block;
  outline: none;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}