I\'m using Twitter Bootstrap and some custom css (found here) to have dropdown menus open up on mouseover.
I am using the \"caret\" on a on the root menu items to show
Just add the css to rotate the caret on mouse hover
.navbar-nav>li>.dropdown-menu{ display:block; visibility:hidden; } .navbar-nav>li:hover>.dropdown-menu{ visibility:visible; } .navbar-default .navbar-nav>li:hover>a .caret{ transform:rotate(-90deg); transition:all 0.3s ease-in-out; }