body{font-family:Arial,sans-serif;background-color:#f4f4f4;margin:0;padding:0}h2{text-align:center;color:#333}nav ul{display:flex;justify-content:center;list-style:none;padding:0}nav li{margin:0 10px}nav a{text-decoration:none;color:#333}button{display:block;margin:20px auto;padding:10px 20px;background-color:#007bff;color:#fff;border:none;border-radius:5px;cursor:pointer}button:hover{background-color:#0056b3}