GenerateClasses.py throws Type Error if CSS classes inherits a class that was already inherited earlier

[timbatt]

class CSSClasses:
    class Padding:
        padding = "1em"

    class SeparateContent(Padding):
        padding = "2em" 
        margin = "2em"

    # This causes an error 
    class RandomClass(SeparateContent, Padding):
        # class content
        pass

TypeError: Cannot create a consistent method resolution
order (MRO) for bases object, Padding, SeparateContent

Preferably this should instead warn the user that the class inherits the same class twice, or find a way to join the
class attributes together systematically.