canvas {
  image-rendering: crisp-edges;
  box-shadow: 0 0 10px black;
  width: calc(var(--width) * 8px);
  height: calc(var(--height) * 8px);
}

canvas.small {
  width: calc(var(--width) * 4px);
  height: calc(var(--height) * 4px);
}