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Додаєш анімацію до випадаючого меню

li:hover .page-nav__mega-menu {
            display: block;
            -moz-animation: flipInX .3s ease-in;
            -webkit-animation: flipInX .3s ease-in;
            animation: flipInX .7s ease-in;
        }

http://www.newmediacampaigns.com/blog/nicer-navigation-with-css-transitions-part-2