Hey guys I’m trying to learn WordPress and elementary etc how to I change the background of a widget etc

I’m trying to make a website for a client and I’m new at this so I got a theme and everything, and have encountered issues along the way like not being able to edit the store page with Elementor so I’ve made a blank one adding my own stuff, now I really wanna stick with the dark theme etc I’m making. As the title says how do I change the background colour of the widgets as per the pic

 

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