MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */
/* Adjust the logo size if needed */
#p-logo a {
    background-image: url("https://static.wikioasis.org/wikigeniuswiki/0/03/WikiGenius_%28red_logo%29.png");
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
}

#p-logo a img {
    opacity: 0;
}