body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f8f8f8;
}

header {
    background: #009688;
    color: white;
    padding: 20px;
    text-align: center;
}

nav ul {
    list-style-type: none;
    padding: 0;
    margin: 10px 0;
    display: flex;
    justify-content: center;
    gap: 20px;
}

nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}

main {
    padding: 30px;
    background: white;
}

footer {
    background: #333;
    color: white;
    text-align: center;
    padding: 15px;
}