nav { font-family: monospace; font-size: 0.85em; padding: 12px 20px; position: fixed; top: 0; left: 0; z-index: 10; }
nav a { color: #ccc; text-decoration: none; }
nav a:hover { text-decoration: underline; }
body { margin: 0; background: #111; overflow: hidden; }
canvas { display: block; }