@media (max-width: 768px) {

    body {
        font-size: 18px !important;
    }

    .dxgvControl, 
    .dxgvDataRow,
    .dxgvHeader {
        font-size: 18px !important;
        line-height: 1.6em !important;
    }

    /*.dx-button, .dx-textbox, input, select {
        font-size: 18px !important;
    }*/

}