html, body { margin: 0; width: 100%; height: 100%; overflow: hidden; overscroll-behavior: none; touch-action: none; background: #000; }
canvas { display: block; width: 100%; height: 100%; touch-action: none; -webkit-user-select: none; user-select: none; }
.demo-caption { position: absolute; z-index: 1; left: 18px; bottom: 16px; color: #eee; font: 14px/1.6 system-ui, sans-serif; pointer-events: none; }
.demo-caption strong, .demo-caption span { display: block; }
.demo-caption span { color: #aaa; font-size: 12px; }