Showing Bootstrap 5 Error in Fixer. "CSS color invalid RGB function."

I’m using to check my website and make sure it’s free of errors, but since I’m using Bootstrap it has some errors Comes in Bootstrap version. Normally, I check what errors are shown and if they are not so important I just override the CSS so that the verifier does not show any errors.

Now I have Bootstrap v5.1.0 installed and found some bugs that I can’t override:


There is something wrong. "CSS: Color: Invalid RGB function." And! The key is yellow (marked as an error)

Why is this a problem? Is this the main reason?

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