XF 1.2 How to Change Last Post Text Color

Hi, how can I change the text color of the last post on forum home? I've looked everywhere and I can't find the option anywhere. If it requires adding code to the Extra.css file, please explain in detail what needs to be added, I don't understand much about it.

This is the text I'm referring to:

Thanks in advance! :)
Thanks for your answer. :) Exactly where do I find this option? I looked in style properties, but I didn't find something like that, I probably missed it.