Thanks for the review! We decided against adding individual color inputs for each widget because it would be quite messy (in terms of UI) compared to how niche it actually is.

The good news though is that it's really easy to do in CSS, I just added it to our documentation so you can just copy and paste it to your instance of Bonjourr: https://bonjourr.fr/docs/customisation/styles/#customise-widget-colors-individually