body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
}

header {
    background: #007bff;
    padding: 15px;
}

header ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 20px;
    margin: 0;
    padding: 0;
}

header ul li a {
    color: white;
    text-decoration: none;
}

main {
    padding: 20px;
    background-color: #fff;
    width: 80%;
    margin: 20px auto;
    border-radius: 8px;
}

footer {
    text-align: center;
    background: #333;
    color: white;
    padding: 10px;
}