Boring is a matter of perspective I guess. I find coding out API endpoints, configuring infrastructure, and building database schema to be excruciatingly boring. But building a UI in the browser and watching it come together is extremely satisfying. Gaining a solid expertise with CSS is table stakes for a web developer IMO. You can raise your nose at it and say "that's not real programming so I don't care", but it's ultimately a part of the whole package and not being able to do it makes you weaker as a developer. You should be able to look at absolutely any design and recreate it perfectly.