How to change color for 'self' variable in a class in Python using custom Theme?

I installed the monokai theme and I started customizing it from ~/.atom/packages/monokai/styles/*.less. I am programming in Python. When customizing this for Python I am stuck on trying to change the color of self variable.

This is how it shows in Atom:
image

If you look at the first word on the 20th line it is just like any other text. I want it to be a different color and different style.

How can I do this? What would be the LESS CSS selector for the self variable? And only the self.