@media all {
    body {
        line-height: 1.5em;
        color: white;
        background: black;
        font-family: sans-serif;
    }
    a:hover {
        color: lightgoldenrodyellow;
        text-decoration: underline;
    }
    a {
        color: lightblue;
        text-decoration: underline;
    }
    a:visited {
        color: lightslategray;
        text-decoration: underline;
    }            
    img {
        border: thin solid lightslategray;
    }
    p, h1 {
        text-align: center;
    }
}