Toggle transparent nav element

Hello, i am hoping that this is simple. I’m working on a site and using the Astra Pro theme, i’ve designed a nice hero landing page with a menu that looks like we’d like it to. The hero section at the top is actually a background video, so i’ve configured the nav menu as ‘transparent’ so it displays behind the nav. All this works great.

However, on other pages, the requirements are slightly different. We like the look of the nav as it is, but we simply want to change it from a transparent menu to one with a background color, since there will be no video background behind it on other pages.

In the header builder for the theme, i see ways to disable the menu/header for posts, or pages, various options. That’s nice, but we really want to use the same menu, just not in its ‘transparent’ state.

Is there a property to toggle via css to accomplish this? Am i missing a setting in the theme itself somewhere? Or, do we need to set about getting into header.php and creating a custom header/nav thru coding? If there’s a video around that talks about this, if someone could point me to it, that would help greatly. Thanks and cheers!