MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */
/* Add animated GIF above sidebar navigation */
#mw-panel:before {
    content: "";
    display: block;
    width: 100%;
    height: 100px; /* Adjust based on your GIF height */
    background-image: url("https://wiki.zenithxi.com/db/resources/assets/animatedlogo.gif");
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
    margin-bottom: 10px;
}