/* basic style for demonstration */
body {
    font-family: sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background: #fefefe;
    color: #222;
}
header, footer {
    background: #333;
    color: #fefefe;
    padding: 1rem;
}
header a, footer a {
    color: #fefefe;
    text-decoration: none;
}
main {
    padding: 1rem;
    max-width: 800px;
    margin: auto;
}
article h1, article h2, article h3 {
    color: #444;
}