Through different examples, in this talk, I hope to convince you that DevTools is a great place to design for the web, and should be your go-to tool for writing CSS.
I've given this talk a couple of times now, at both Digital Croydon and an ASOS Community Event. I've only given three talks before and it's been a learning process—it certainly gets easier with every talk.
Credit goes to https://umaar.com for some of the GIFs. If you want to keep up on the latest DevTools tricks I recommend his DevTools blog.