What is the easiest way to change the highlight color of fields in Bootstrap 4 forms?

Question

css

Hello.
I would like to be able to easily and easily change the highlight color of handicap fields in Bootstrap 4 - what is the best way to do this?
Maybe there are some online generators or something like that? I didn't find it myself. Please provide a link if anyone has one.
P.S. There is something like that for version 3.4 https://getbootstrap.com/docs/3.4/customize/ - but for the four I have not found it yet.

Answer 1

https://getbootstrap.com/docs/4.2/getting-started/...
UPD:
https://bootstrap.build/