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

header {
    background-color: #333;
    color: #fff;
    padding: 1rem;
    text-align: center;
}

nav {
    background-color: #eee;
    padding: 1rem;
}

nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    text-align: center;
}

nav li {
    display: inline-block;
    margin: 0 1rem;
}

main {
    padding: 1rem;
}

footer {
    background-color: #333;
    color: #fff;
    padding: 1rem;
    text-align: center;
}