@media screen and (max-width: 700px) {
    .big {
        display: none !important;
    }

    .small {
        display: table-cell !important;
    }
}

@media screen and (min-width: 701px) {
    .big {
        display: table-cell !important;
    }

    .small {
        display: none !important;
    }
}