Force Nav item Underline to Display

I'm currently using this code to display underlines on a parent-level active page:

.header-nav-item--active a {
  border-bottom: 2px solid #D79D4D !important; 
  background-image: none !important;
}

For subpages that technically belong under a parent nav item, is there a way to force that underline to continue to display on it's subpages?

URL: upliftingme.co

I don't see any subpages in main navigation. Can you check it again?

Or you mean

when users click on each item on this page: https://upliftingme.co/movements

will underline "Movements" item?

@tuanphan

Yes, that's what I meant by "subpages". When a visitor clicks on any item on the Movements page, and is taken to that "subpage", I would like for the Movements nav item to still be in an active state.

Similarly, I'd like the same to happen for "Artists", "Articles" and "Quizzes" nav items.

@tuanphan perfect! don't mind the manual. Thanks!