Change sidebar background color?

I created a sidebar wideget to put the main menu there

Is there a way to change the background color of the sidebar so it looks different than the main text area?

I’m using free version of astra.

If I put the menu back, across the top like the default, is there a way to change the background color of the menu area to make it stand out more?

The page I need help with: [log in to see the link]