body {
    font-family: sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f0f0f0;
}

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

nav a {
    color: white;
    text-decoration: none;
    margin: 0 10px;
}

main {
    padding: 20px;
}