It’s very cool to work with CSS as it can definitely help elevate designs, animations and depending on the use case, allow you to make changes to multiple elements at once.
This article is a good starting place and the team did a webinar about it that you can see here as well. I also did a video a bit ago that I shared in the forum showcasing how you can use it to style elements as well that normally are a bit more limited in terms of design. https://www.youtube.com/watch?v=an-TqcFsHnM