.NewsSummaryItem.Horizontal > .articleSummaryItem {
    width: 100%;
}

.NewsSummaryItem.Horizontal {
    display: flex;
    justify-content: space-between;   
    flex-direction: row;
    flex-wrap: wrap;
}

@media all and (min-width:768px)
{
    .NewsSummaryItem.Horizontal > .articleSummaryItem {
        width: 30%;
    }
}