.gallery_tabs {margin: 20px 0;}

.gallery_tabs .nav-tabs {width: 100%; max-width: none; margin-bottom: 15px;}

.popup-gallery {flex-wrap: wrap;}
.popup-gallery img {width: 100%;}
@media only screen and (max-width : 1023px) {
    .popup-gallery .col-3 {
        width: 33.3333%
    }
}
@media only screen and (max-width : 767px) {
    .popup-gallery .col-3 {width: 50%}
}
@media only screen and (max-width : 500px) {
    .popup-gallery .col-3 {width: 100%}
}