body{font-family:Arial,sans-serif;background-color:#202020;color:#fff;text-align:center;padding:20px}.container{max-width:500px;margin:auto;background:#404040;padding:2rem;border-radius:1rem;box-shadow:0 4px 10px #0003}button{background-color:#3eb2d7;border:none;padding:1rem 2rem;margin:1rem;font-size:1rem;cursor:pointer;border-radius:.5rem}button:hover{background-color:#3eb2d7}.hidden{display:none}