How to place a permanent negative margin, or white space behind transparent menu

Here's an interesting one for ya...

When setting my menu as transparent, the menu is a different color on none sticky menu pages because there is no white background behind the menu. To fix this I just made a negative top margin on my home page content so that there was something behind the menu, but I don't want to do this for all my pages moving forward (plus this solution didn't work on mobile).

So is there a way to fix this issue permanently? Can white space be put behind the menu for all pages?

Thanks!