CSS Gnomes

This will be February 16 comiCSS edition. It is inspired by a Liniers' cartoon and his gnomes (or is it elves?) I created this small cartoon with CSS gnomes fighting about the best background gradient.

The radial gradient gnomes advocate for radial gradients, and the linear gradient gnomes advocate for linear gradients, and it looks like they will never reach an agreement. Maybe they are not radial gradients but radical gradients instead (sorry, terrible pun.)

But little does one group know, there's a spy among their ranks! Can you point the odd gnome out? It's a bit subtle, but not too complicated (I hope).

Here's a private CodePen with the source code and a live demo with the cartoon.