@media(max-width: 992px) {
    .main-nav {
       /* position: fixed;
        top: 0;
        bottom: 0;
        z-index: 9999;*/
        overflow-y: visible !important;
    /*    left: -260px;
        width: 260px;
        padding-top: 18px;
        background: rgba(19, 39, 57, 0.8);
        transition: 0.4s;*/
    }


        .main-nav .drop-down ul a {
            padding: 3px !important;
        }

    .dropdown-menu.columns-3 {
        width: 90%;
    }

        .dropdown-menu.columns-3 .dropdown-item {
            width: 100%;
            float: left;
        }

    .dropdown-menu.columns-2 {
        width: 90%;
    }

        .dropdown-menu.columns-2 .dropdown-item {
            width: 100%;
            float: left;
        }

    .dropdown-menu.columns-3600 {
        width: 90%;
        left:0px !important;
    }

        .dropdown-menu.columns-3600 .dropdown-item {
            width: 100%;
            float: left;
        }

}