MediaWiki:Timeless.css

/* All CSS here will be loaded for users of the Timeless skin */
   #mw-content-container {
        background: #75005c;
        background-image: url(https://static.miraheze.org/ate42wiki/3/37/FonBlueGreen.svg);
        background-repeat: no-repeat;
        background-size: cover;
    }