MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */
/* Enforce logo size and behavior across all pages */
.mw-wiki-logo {
    background-size: contain;
    background-position: center center;
    background-repeat: no-repeat;
    width: 100%;
    height: auto;
    max-width: 135px;
    max-height: 135px;
}

/* Apply size and positioning on special pages */
body.special-page .mw-wiki-logo,
body.login-page .mw-wiki-logo {
    background-size: contain;
    background-position: center;
    max-width: 135px;
    max-height: 135px;
}