body, html{
  background-color: black;
  overflow: hidden;
  margin: 0;
  width: 100%;
  height: 100vh;
}
canvas {
    max-width: 100%;
    max-height: 100%;
    margin: auto;
    overflow: auto;
    position: fixed;
    object-fit: contain;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
}