I am using Ubuntu mate 18.04.3 LTS.
I am quite fond of my background color and would like to use it on another machine. Where can I find the exact color that is used? When I go into the Control center and get the Appearance Preferences window, and then the Background tab, I see my color, but when I click on my background color next to Color: Solid color, I get a color selector that is positioned on a red color, while I want a blue color, so that is not the current one.