#thumbs_list li img {
    width: 100%;
    height: auto;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box; }
@media (min-width: 768px) and (max-width: 991px) {
    #thumbs_list li img { width: 68px; height: 68px; }
}
img .video-thumb {
@media (min-width: 768px) and (max-width: 991px) {
    #thumbs_list li img { width: 68px; height: 68px; }
}