body {
    font-family: monospace;
    font-size: 12pt;
    max-width: 38em;
    margin: 0 auto;
    padding: 0;
}

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

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

nav {
    background-color: #eee;
}

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

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

nav a {
    text-decoration: none;
    color: #333;
    font-weight: bold;
}

main {
    background-color: #f8f8f8;
    padding: 20px;
}

#content {
    max-width: 26em;
    margin: 0 auto;
}

footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 10px;
    bottom: 0;
}