What about a transparent background?

MyPaint version: 2.0.1 (Kubuntu) 18.04
lenovo Helix 2

With me back on MyPaint as main drawing program for engineering students (so, no art work required, but love infinite canvas and much more!), I wonder if I couldn’t sue it for ALL my drawings and stop using Gromit-MPX? But I’d need a simple, but fully transparant background so that MyPaint could simply lie above everything else as full screen. Yep, as screen drawing program.

Kind regards,