.navbar-nav li:hover > ul.dropdown-menu {
  display: block;
}
.dropdown-submenu {
  position:relative;
}
.dropdown-submenu>.dropdown-menu {
  top: -11px;
  left: 100%;
  /* margin-top:-6px; */
}

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