[feature request] widget color

[usamasaleem1]

would be neat to change color of widget progress bar line. Some colors doesnt sit well with my setup.

[mattvchandler]

Something I'd like to look at in the future is adding Material You support into this app, which would help it match other apps (at least those also supporting it). I've had and still have a lot going on in my personal life right now, so I don't think I'll get around to doing that anytime soon.
If you're wanting to tackle just changing the colors for yourself, it's pretty low effort.
In app/src/main/res, look for the values*/colors.xml files. Change them to whatever you'd like in your own fork.
Adding a color picker is slightly more involved, but feel free to submit a PR if you get it working