MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */
/* oo-ui-selectFileWidget-thumbnail is from when someone are uploading images
   And cdx-menu-item-thumbnail are from the search dropdown
Above are these classes who need to have filter invert disabled
*/
.cdx-menu-item__thumbnail{
    filter: unset !important;
}

/* Sort of workaround for the inverted image fix */
.client-darkmode oo-ui-selectFileWidget-thumbnail{
    filter: invert(1) hue-rotate(180deg);
    -webkit-filter: invert(1) hue-rotate(180deg);
}

📢 Important Notice 📢