Proposal / advice needed: use background color to visualize expression depth instead of delimiters text color

[idrozd]

Hello and thank you for your work!

I want to experiment implement following feature basing on rainbow-delimiters:
use background colour lightness gradation to visualise expression depth instead of delimiters text colour.

I have no elisp experience.

Can you give some advise on this topics:
Is is possible?
What elisp manual would you recommend?
What do I need to understand to make this work?

[Fanael]

You can just set the :background property on the respective faces by using set-face-attribute or a custom theme.