@media (max-width: 55rem) {
    .row .column.responsive[class*=" column-"] {
        margin-left: 0;
        min-width: 80%;
    }    
}

@media (max-width: 70rem) {

    .row .column[class*=" column-"] {
        min-width: 45%;
    }

    .row .column.responsive[class*=" column-"] {
        margin-left: 0;
        min-width: 70%;
    }    
}