html, body { margin: 0; height: 100%; background: #000; color: #ccc; font-family: Arial, sans-serif; }
body { display: flex; flex-direction: column; align-items: center; justify-content: center; }
canvas { width: min(100vw, 200vh); height: auto; aspect-ratio: 2 / 1; background: #000; image-rendering: pixelated; }
.help { margin: 8px 0 0; font-size: 14px; }