.toc-dropdown .dropdown-menu.show{animation:.5s popdown;transform-origin:top;overflow-y:hidden}@keyframes popdown{from{opacity:0;transform:translate(0,40px) scaleY(0)}to{opacity:1;transform:translate(0,40px) scaleY(1)}}.toc-dropdown .dropdown-toggle i{transition:rotate .5s ease-in-out}.toc-dropdown .dropdown-toggle.show i{rotate:90deg}