html,
body {
  position: absolute;
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: black;
}

canvas {
  display: block;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  height: min(100vh, calc(100vw * 1.333)) !important;
  width: min(100vw, calc(100vh * 0.75)) !important;
}