body {
    font-family: Arial, sans-serif;
}

header, nav, footer {
    text-align: center;
    padding: 20px;
    background-color: #f8f8f8;
}

nav ul {
    list-style-type: none;
    padding: 0;
}

nav ul li {
    display: inline;
    margin: 0 20px;
}

nav ul li a {
    text-decoration: none;
    color: #333;
}

main {
    margin: 20px;
}

footer {
    font-size: 14px;
}