body {
    background-color: #222;
}

h1 {
    color: #ccc;
    font-family: "Courier New", Courier, monospace;
    font-size: 3.5em;
    text-align: center;
}

a {
    color: lightgray;
}
a:visited {
    color: lightblue;
}

a[target="_blank"]:after {
    content: " (external)";
    text-decoration: none;
}