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