MediaWiki:Vector.css

/* Site logo */
 * 1) p-logo a { background: url(https://wikibound.info/w/images/thumb/b/bc/WikiBound.png/150px-WikiBound.png) 75% 50% no-repeat !important; }
 * 2) p-logo a:hover { background: url(https://wikibound.info/w/images/thumb/b/bc/WikiBound.png/150px-WikiBound.png) 75% 50% no-repeat !important; }