body {
    font-family: Arial, sans-serif;
    background: #f4f4f4;
    text-align: center;
    margin-top: 100px;
}

header {
    background: #0077ff;
    color: white;
    padding: 20px;
}

button {
    padding: 12px 20px;
    border: none;
    background: #222;
    color: white;
    cursor: pointer;
    border-radius: 5px;
}

button:hover {
    background: #444;
}