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