MediaWiki:Common.css

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/* Logo: top center, natural size (416x100), responsive */
#p-logo {
    position: fixed;
    left: 50%;
    transform: translateX(-50%);
    top: 5px;
    z-index: 1000;
}
.mw-wiki-logo {
    background-size: contain !important;
    background-repeat: no-repeat !important;
    background-position: center !important;
    width: 416px !important;
    height: 100px !important;
    display: block;
}
#mw-head      { top: 110px; }
#mw-head-base { height: 110px; }
#mw-page-base { padding-top: 110px; }
#mw-panel     { padding-top: 110px; }

@media (max-width: 900px) {
    .mw-wiki-logo { width: 300px !important; height: 72px !important; }
    #mw-head, #mw-head-base { top: 82px; height: 82px; }
    #mw-page-base { padding-top: 82px; }
    #mw-panel     { padding-top: 82px; }
}
@media (max-width: 600px) {
    .mw-wiki-logo { width: 200px !important; height: 48px !important; }
    #mw-head, #mw-head-base { top: 58px; height: 58px; }
    #mw-page-base { padding-top: 58px; }
    #mw-panel     { padding-top: 58px; }
}