body{font-family:Arial;background:#1a1a1a;color:#fff;margin:0;padding:0;min-height:100vh;display:flex;align-items:center;justify-content:center}.container{text-align:center}button{background:#333;color:#fff;border:2px solid #555;padding:15px 30px;font-size:18px;cursor:pointer;border-radius:8px}button:hover{background:#444;border-color:#666}