body{margin:0;font-family:Arial,sans-serif;background:#0b0b0b;color:#fff}nav{background:#000;color:#fff}.container{max-width:1200px;margin:auto;padding:40px 20px}h1,h2,h3{margin-bottom:10px}button{background:#fff;color:#000;border:none;padding:12px 24px;border-radius:30px;font-weight:700;cursor:pointer}button:hover{background:#e6e6e6}