MediaWiki:Vector.css

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/* For Vector 2022 Skin */
.vector-header-logo {
    max-width: 200px !important;  /* Change width as needed */
    max-height: 60px !important;  /* Adjust height */
    padding: 0 !important;
    margin: 0 !important;
}

/* For classic Vector logo container */
.mw-logo-icon {
    width: 200px !important;  /* Or your preferred width */
    height: auto !important;  /* Maintain aspect ratio */
}

/* Optional: Adjust logo position */
.vector-header .mw-logo-container {
    padding-top: 5px;
}