Bugs cookieconsent.min.css

line 2 and line 3 : the css “display:-ms-flexbox” doesn’t exist and create an error in the last release of Waterfox.
A lot of other css are unknown :

Best regards

This sounds like an issue with the library, cdnjs isn’t reponsible for any library code.
I would suggest that you report this issue on their project Github: https://github.com/osano/cookieconsent