body{font-family:Arial,sans-serif;margin:0;padding:20px;background-color:#f5f5f5}.container{max-width:800px;margin:0 auto;background-color:#fff;padding:20px;border-radius:8px;box-shadow:0 2px 4px #0000001a}h1{color:#333;text-align:center}button{background-color:#4caf50;border:none;color:#fff;padding:10px 20px;text-align:center;text-decoration:none;display:inline-block;font-size:16px;margin:10px 5px;cursor:pointer;border-radius:4px;transition:background-color .3s}button:hover{background-color:#45a049}