#top-menu li ul.sub-menu{transition:all 1s ease;visibility:hidden;opacity:0;display:block}#top-menu li:hover ul.sub-menu{visibility:visible;opacity:1}#top-menu li ul.sub-menu{-webkit-transition:all 1s ease;-moz-transition:all 1s ease;-o-transition:all 1s ease;transition:all 1s ease}