.vimeogallery {
    width: 100%;
    position: relative;
    padding: .2em;
    
}

.vimeogallery>.player_ctr {
    padding:56.25% 0 0 0; 
    position:relative;
}

.vimeogallery>.player_ctr>iframe {
    position:absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.vimeogallery>ul.video_thumbs {
    list-style-type: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    width: 100%;

}

.vimeogallery>ul.video_thumbs>li.item {
list-style: none;
    display: flex;
    flex-direction: column;
    flex-basis: 46.25%;
    margin: 0.5em;
    align-content: space-around;
    width: 100%;
}

.vimeogallery>ul>li>a.video_thumb.active {
    border: 2px solid orange;
}