.navbar-nav li:hover > div.dropdown-menu {
  display: block;
}

.dropdown-submenu {
  position: relative;
}

.dropdown-submenu > .dropdown-menu {
  top: 0;
  left: 100%;
  margin-top: -6px;
}

/* rotate caret on hover */

.dropdown-menu > li > a:hover:after {
  text-decoration: underline;
  transform: rotate(-90deg);
}