ll its container */
  height: 100%;
}
:root {
  --bg-color: #fff;
  --line-color-1: #AAA;
  --line-color-2: #DDD;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #000;
    --line-color-1: #666;
    --line-color-2: #333;
  }
}
canvas {
  display: block;  /* make the canvas act like a block   */
  width: 100%;     /* make the canvas fill its container */
  height: 100%;
  background-color: var(--bg-color);
  background-image: linear-gradient(var(--line-color-1) 1.5px, transparent 1.5px),
   