argon-dashboard-react/src/assets/scss/argon-dashboard/custom/navbars/_navbar-dropdown.scss

// Dropdown menu

@include media-breakpoint-up(md) {
    .navbar {
        .dropdown-menu {
            opacity: 0;
            pointer-events: none;
            margin: 0;
        }

        .dropdown-menu-arrow {
            &:before {
                background: $dropdown-bg;
                box-shadow: none;
                content: '';
                display: block;
                height: 12px;
                width: 12px;
                left: 20px;
                position: absolute;
                bottom: 100%;
                transform: rotate(-45deg) translateY(12px);
                z-index: -5;
                border-radius: 2px;
            }
        }

        .dropdown-menu-right {
            &:before {
                right: 20px;
                left: auto;
            }
        }

        &:not(.navbar-nav-hover) {
            .dropdown-menu {
                &.show {
                    opacity: 1;
                    pointer-events: auto;
                    animation: show-navbar-dropdown .25s ease forwards;
                }

                &.close {
                    display: block;
                    animation: hide-navbar-dropdown .15s ease backwards;
                }
            }
        }

        &.navbar-nav-hover {
            .dropdown-menu {
                opacity: 0;
                display: block;
                pointer-events: none;
                transform: translate(0, 10px) perspective(200px) rotateX(-2deg);
                transition: visibility 0.25s, opacity 0.25s, transform 0.25s;
            }

            .nav-item.dropdown:hover > .dropdown-menu {
                display: block;
                opacity: 1;
                pointer-events: auto;
                visibility: visible;
                transform: translate(0, 0);
                animation: none;
            }
        }

        .dropdown-menu-inner {
            position: relative;
            padding: 1rem;
        }


        // Keyframes

        @keyframes show-navbar-dropdown {
            0% {
                opacity: 0;
                transform: translate(0, 10px) perspective(200px) rotateX(-2deg);
                transition: visibility 0.25s, opacity 0.25s, transform 0.25s;
            }

            100% {
                transform: translate(0, 0);
                opacity: 1;
            }
        }

        @keyframes hide-navbar-dropdown {
            from {
                opacity: 1;
            }

            to {
                opacity: 0;
                transform: translate(0, 10px);
            }
        }
    }
}