html,
body {
  padding: 0;
  margin: 0;
  height: 100%;
  width: 100%;
}
body {
  overscroll-behavior: contain;
  background: #000;
}
canvas {
  padding: 0;
  margin: auto;
  display: block;
  position: absolute;
  object-fit: contain;
  object-position: center;
  top: 0;
  left: 0;
  right: 0;
  width:1200px;
  height: 1200px;
  max-width: 100vw;
  max-height: 100vh;
}