@media screen and (max-width: 991px) {
    div .geek_news-col {
        flex:0 0 50%;
        max-width: 50%
    }
}

@media screen and (max-width: 479px) {
    div .geek_news-col {
        flex:0 0 100%;
        max-width: 100%
    }
}