How to obfuscate css classes?

Question

css

Only hash functions come to mind. Is there such a function that would produce a string (Latin letters, underscores and numbers) of different lengths depending on how often the class name occurs. Tell me please.

Answer 1

htmlmuncher.com
https://github.com/google/closure-stylesheets
But you should be clear that from an optimization point of view, this is a pointless exercise.