Fun:Nil/styles.css

.mw-wiki-logo {
    background-image: url("https://wse.hehe.moe/wiki/images/8/8b/Glitched_wiki_logo.gif");
}
*:before {
    content: 'nil';
    color: #ff0000;
}
*:after {
    content: 'nil';
    color: #ff0000;
}