Cannot figure out what element header color is in wordpress theme [closed]

You can use your browsers Inspector via it’s Developer Tools to hover-and-reveal the class andor id name(s) of all html elements on a webpage.

inspector

Here’s some links to popular browsers and how to get started with the tool

For your site, I believe css of 

#site-navigation { background: black !important; }

will do what you’re after

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