How Do You Remove Unused CSS From a Site?
Here's what I'd like you to know upfront: this is a hard problem. If you've landed here because you're hoping to be pointed at a tool you can run that tells you exactly what CSS you can delete from your project, well... there are tools out there, but I'm warning you to be very careful with them because none of them can ever tell you the complete story.
I know what you want. You want to run the tool, delete what it tells you, and you have a faster site in 2.2 minutes. I'm sorry, but I'm going to disappoint you.
I think you should have a healthy level of skepticism for any tool like that. None of them are exactly lying to you — they often just don't have enough information to give you results that are safe and actionable. That's not to say you can't use them or it can't be done. Let's take...