body {
    font-family: sans-serif;
    margin: 0;
    background: #f5f5f5;
}

header {
    background: #333;
    color: white;
    padding: 20px;
}

nav a {
    color: #fff;
    margin-right: 15px;
    text-decoration: none;
}

main {
    padding: 20px;
}

footer {
    background: #222;
    color: #fff;
    padding: 10px;
    text-align: center;
}