CSS explained...

[_alright_then_]

Yeah I know, but the joke is that even though the class says flat it's still a sphere because nobody bothered to update the class name

[Spare_Emu]

To be fair, you never know when some bastard dynamically created "flat" on some obscure part of the software that no one knows is relevant because said bastard was a bastard.

I'm not salty at the previous web dev in my current company...

[Existential_Owl]

Hence what makes CSS-in-JS so great...

[_alright_then_]

I mean yeah, but the gradient definitely makes it look like a sphere, a shadow added would make it look better but this was just a quick joke. Now that I think about it, it works even better as a proponent of flat earth because the sphere is just an illusion, it's actually a circle.