I've added a background image to the Simple theme, but now I'd like to have solid-color backgrounds behind the sidebar menu and the main body of all pages (where products/collections/content would appear). I can't find the element that needs to be modified in the code, though, and I'm pulling my hair out. I've attached a screenshot with the two sections that I want to add backgrounds to. Can anybody tell me where in the code to add the background css? Thanks!
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