MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */
/* Enforce logo size and containment across all pages */
#p-logo a {
    background-size: contain !important;  /* Ensure the background scales to fit */
    background-position: center center !important;  /* Center the logo */
    width: 135px !important;  /* Explicit width for consistency */
    height: 135px !important; /* Explicit height for consistency */
}

.mw-wiki-logo {
    max-width: 135px !important;  /* Limit max width */
    max-height: 135px !important; /* Limit max height */
    object-fit: contain;  /* Ensure the image scales to fit within bounds */
}