.mw-rcfilters-ui-filterWrapperWidget { width: 100%; // Make sure this uses the interface direction, not the content direction direction: ltr; &-popup { // We have to override OOUI's definition, which is set // on the inline style of the popup margin-top: 2.4em !important; max-width: 650px; .oo-ui-popupWidget-body { max-height: 70vh; } } &-search { max-width: none; margin-top: -0.5em; input { // We need to reiterate the directionality // for the input as well to literally override // a MediaWiki CSS rule that turns it 'ltr' direction: ltr; } } }