Extract existing CSS Class so I can modify and use it in a new Custom CSS Class

I would like to modify some CSS in Enfold (using my child theme).

Is there any way to extract entire CSS from Enfold and put it in my Child Theme to be modified.
It would be much easier to see and entire class rather than trying to change individual elements blindly.

For example, I would like to specify my own Custom CSS Class for an IconBox….but I would like to:
Copy the existing class
Give it a new name
Specify that new name as the Custom CSS Class
Make changes to the class as needed…either in style.css of my child theme, or even put the Custom CSS Class in another file.

Any advice you can give me would greatly help.

Thanks,
-Owen