MediaWiki:Vector.css

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/* All CSS here will be loaded for users of the Vector skin */
#p-logo .mw-wiki-logo {
    width: 100% !important;
    max-width: 135px !important;
    height: auto !important;
    max-height: 135px !important;
    background-size: contain !important;
    background-position: center !important;
    background-repeat: no-repeat !important;
}