@media (max-width: 767px) {

    #order-standard_cart .cart-body {
        width: 100% !important;
        float: none !important;
        clear: both !important;
    }

    #order-standard_cart .cart-sidebar {
        width: 100% !important;
        float: none !important;
        clear: both !important;
        margin-top: 20px !important;
    }
}