body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}
nav {
    background: #333;
    color: #fff;
    padding: 1em;
}
nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    display: flex;
}
nav li {
    margin-right: 1em;
}
nav a {
    color: white;
    text-decoration: none;
}
main {
    padding: 2em;
}
footer {
    background: #eee;
    text-align: center;
    padding: 1em;
}