body {
  margin: 0;
  padding: 0;

  background-color: white;

  /* leave it to hide the scrollbars */
  overflow: hidden;
}

canvas#my-canvas {
  max-width: 100%;
  max-height: 100%;
  margin: 0 auto;
  position: fixed;
  bottom: 0;
  top: 0;
  left: 0;
  right: 0;
  object-fit: contain;
}