*{margin:0;padding:0;box-sizing:border-box}body{font-family:Arial,sans-serif;display:flex;justify-content:center;align-items:center;min-height:100vh}.container{text-align:center;max-width:800px;padding:20px}h1{font-size:2.5rem;margin-bottom:1rem;color:#333}p{font-size:1.2rem;margin-bottom:2rem;color:#666}#playBtn{font-size:1.1rem;padding:12px 30px;background-color:#06c;color:#fff;border:none;border-radius:5px;cursor:pointer;transition:background-color .3s}#playBtn:hover{background-color:#0052a3}#videoPlayer{margin-top:2rem;max-width:100%;display:none;border-radius:8px}#videoPlayer.show{display:block}