body{margin:0;font-family:Arial;background:#111;color:#fff;text-align:center}
header{padding:10px;background:#000;font-weight:bold}
video,canvas{width:100%;max-height:70vh}
.controls{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;padding:10px}
button{padding:10px;border-radius:6px;border:none}