MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */

/* Adjust the logo size */
.mw-header-logo a, .mw-logo a {
    width: 300px; /* Example: new width in pixels */
    height: 300px; /* Example: new height in pixels */
    background-size: 100% 100%; /* Ensures the entire image is displayed */
}