I have made the background color in the desktop top bar black and want the clock or time to show in white (the bar is autohide and I want the clock to show when the bar glides down, this worked in 18.04), so it shows on a black background without clicking on it. It shows when clicking on it in white but only after I click on it otherwise it is just black like the bar. I assume it is some where in evolution but can not find it including in the ui files.
Right click taskbar> properties>background>solid color is how you change the background to black.
As far as I know picking a theme with white lettering is the only way to get white letters. You may have to experiment.
Maybe someone else knows how to do that in the terminal?