html, body { margin: 0; width: 100%; height: 100%; overflow: hidden; background: #111515; }
#canvas-container { width: 100%; height: 100%; display: grid; place-items: center; }
canvas { display: block; touch-action: none; }
#frame-error { position: absolute; inset: 20px; padding: 20px; color: #f1dfcc; background: #242424; font: 16px/1.5 sans-serif; }