Template:FeaturedGallery/styles.css

/*remove "display thumbnails" button as it doesn't work in our layout*/ 
span.oo-ui-widget:nth-child(2) > a:nth-child(1){
    display:none
}
/*Regulate image heights to prevent overflow on larger images such as filmstrips*/
.mw-gallery-slideshow-img-container img {
    max-height:350px
}