Hi
The menu item you are using as a parent is a text separator and in demo its a menu type with active class.
Use below code to apply the class on your menu item
.navbar-default .navbar-nav > .active > .separator, .navbar-default .navbar-nav > .active > .separator:hover, .navbar-default .navbar-nav > .active > .separator:focus {
color: #ffffff;
background-color: transparent;
}
.navbar-default .navbar-nav > .active > .separator .caret,
.navbar-default .navbar-nav > .active > .separator:hover .caret, .navbar-default .navbar-nav > .active > .separator:focus .caret {
color: #ffffff;
border-top-color: #ffffff;
border-bottom-color: #ffffff;
}
Regards