How to fold the code block?

Hi dear developer:
this is definitely the most perfect syntax highlighting plug in I have ever used.
But I have a question, how can I fold and unfold the code?
Sometimes the code is really such long that it does not suitable to directly display in the post. Allowing viewers to choose folding or unfolding the code blocks can really enhance the user experience, but I did not find this function.
Could you add this small function into the next update?
Is there any CSS codes I can add into it to allow people fold and unfold it?
Thank you for making such perfect plug-in again.