User:KnowledgeJunkie/vector.css

:root { 
    background-color: #141414 !important;
}

.mw-rcfilters-ui-changesListWrapperWidget .mw-changeslist-legend {
    background-color: #141414;    
}

.mw-rcfilters-ui-filterTagMultiselectWidget {
    background-color: #141414;
}