.dropdown-submenu { cursor:pointer; }
.dropdown-submenu > ul { padding-left: 0; background-color: #cccccc; max-height: 0; overflow: hidden; transition: max-height .15s ease-in; }
.dropdown-submenu.open > ul { max-height: 320px; }
.dropdown-submenu .chevron { color: #cccccc; }
.dropdown-submenu .icon-chevron-thin-up { display: none; }
.dropdown-submenu.open .icon-chevron-thin-down { display: none; }
.dropdown-submenu.open .icon-chevron-thin-up { display:inline; }



.navbar-dark .dropdown-submenu > ul { background-color: #4d5052; }