Yes you can in the Pro version.

Select ‘Display colour’ from the Menu and you’ll see the new option ‘Screen colour’:

Screen colour option

Selecting this option gives you 10 customisable background colours to choose from. These colours are separate from the 10 customisable text colours, and they are also separate for each Profile too.

The colours for day and night are also independent.

Just ensure that you pick contrasting colours for the screen and the text…