#primary-menu ul li #nav_categories.mega-menu-content li:not(.megamenu-dropdown) {
    display: block!important;
    opacity: 1!important;
    top: 0;
    left: 0;
}

.dark #primary-menu:not(.not-dark) ul li #nav_categories.mega-menu-content li, .dark #primary-menu:not(.not-dark) ul li #nav_categories.mega-menu-content, #primary-menu.dark ul li #nav_categories.mega-menu-content li, #primary-menu.dark ul li #nav_categories.mega-menu-content {
    background-color: #333;
    border-color: #3f3f3f;
    border-top-color: #1abc9c;
}

#primary-menu ul li #nav_categories.mega-menu-content li {
    display: block;
    position: relative;
    top: 0;
    min-width: inherit;
    border: 0;
    box-shadow: none;
    background-color: transparent;

    flex: 0 0 25%;
    max-width: 25%;
}

#primary-menu ul li #nav_categories.mega-menu-content li a:first-child {
    margin-top: 0;
    border-top: 0;
    float: none;
    margin: 0;
    position: relative;
    padding: 0;
}