unsupported CSS properties like 'flex' updates?

[yvermabp]

          @danfickle  Thanks for the great library! We've explored it for various use cases but have run into an issue with unsupported CSS properties like 'flex'. Do you have any updates on whether support for this will be added in the future?

Originally posted by @yvermabp in https://github.com/danfickle/openhtmltopdf/issues/69#issuecomment-2401478745