body {
  background-color: black;
  margin: 0;
  overflow: hidden;
}
canvas{
  width: min(100vw,100vh);
  height: min(100vw,100vh);
  padding: 0;
  margin: auto;
  display: block;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: black;
}