#catExpPagesBs {
    position: relative;
}

#catExpPagesBs .flex {
    position: relative;
    display: flex;
    display: -webkit-flex;
    flex-flow: row wrap;
}

#catExpPagesBs .flex .item {
    position: relative;
    flex: 0 0 33%;
    -webkit-flex: 0 0 33%;
    -ms-flex: 0 0 33%;
}

@media all and (max-width: 900px) {
    #catExpPagesBs .flex .item {
        flex: 0 0 100%;
    }
}