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.
Here’s some links to popular browsers and how to get started with the tool
- https://developer.chrome.com/devtools
- https://developer.mozilla.org/en-US/docs/Tools/Page_Inspector
- https://developer.apple.com/library/content/documentation/NetworkingInternetWeb/Conceptual/Web_Inspector_Tutorial/EnableWebInspector/EnableWebInspector.html
For your site, I believe css of
#site-navigation { background: black !important; }
will do what you’re after
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