@media (min-width: 992px) {
    .navbar .nav-item .dropdown-menu {
        display: block;
        margin-top: 0;
        opacity: 0;
        visibility: hidden;
        transition: .5s;
    }

    .navbar .dropdown-menu.fade-down {
        top: 100%;
        transform: rotateX(-75deg);
        transform-origin: 0% 0%;
    }

    .navbar .nav-item:hover .dropdown-menu {
        top: 100%;
        transform: rotateX(0deg);
        visibility: visible;
        transition: .5s;
        opacity: 1;
    }
}