html {
  height: 100vh;
}

body {
  height: 500vh;
  background: #ffffff;
}

canvas {
  position: fixed;
  /* left: 50%; */
  /* top: 50%; */
  /* transform: translate(-50%, -50%); */
  /* max-width: 100vw; */
  /* max-height: 200vh; */
  margin: 0 auto;
  display: block;
}