MediaWiki:Common.css

/* CSS placed here will be applied to all skins */
.toclimit-1 .toclevel-2 {
    display: none;
}
.toclimit-2 .toclevel-3 {
    display: none;
}

/* Used by PageGallery Template */
img.thumbimage.pagegallery {
    width: 240px;
    height: 160px;
    object-fit:cover;
}