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

header, nav, main, footer {
    padding: 20px;
    margin: 20px;
}

header {
    background-color: #333;
    color: white;
}

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

nav li {
    display: inline;
    margin-right: 10px;
}

nav a {
    text-decoration: none;
}

main {
    background-color: white;
    padding: 20px;
}

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