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

body {
    display: flex;
    min-height: 100vh;
}

nav {
    min-width: 8em;
    width: 10em;
    padding: 1em;
    border-right: 1px solid black;
}

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

nav li {
    margin-bottom: 0.5em;
}

nav a {
    text-decoration: none;
    color: black;
}

nav a:hover {
    text-decoration: underline;
}

main {
    margin: 1em;
    padding: 0;
}

@media (max-width: 600px) {
    body {
        flex-direction: column;
    }

    nav {
        width: auto;
        border-right: none;
        border-bottom: 1px solid black;
    }
}

article {
    max-width: 700px;
}

main h1 {
    margin-top: 0;
}