MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */
.minerva-header .branding-box a {
    display: none;
}

/* Add your logo */
.minerva-header .branding-box {
    background-image: url('/resources/assets/LC_Logo_1x.png');
    background-size: contain; /* Adjust as necessary */
    background-repeat: no-repeat;
    background-position: center;
}