html, body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  width: 100vw;
  height: 100vh;
  width: 100dvw;
  height: 100dvh;
  background: #000;
}

canvas {
  display: block;
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
}