Original Merida font doesn't have gradients, but here on Lichess it does. I prefer the original clean look, but maybe others don't.
Anyway, I don't have a GitHub account to make a pull request, and highly likely it will be rejected, but I found "Stylish" browser extension that can be used to overwrite CSS on any site.
Here the CSS for Merida without gradient (I just removed the gradient from the Lichess SVGs with Inkscape): pastes.io/rf5orhtvsm
With gradient:
Without gradient:
Anyway, I don't have a GitHub account to make a pull request, and highly likely it will be rejected, but I found "Stylish" browser extension that can be used to overwrite CSS on any site.
Here the CSS for Merida without gradient (I just removed the gradient from the Lichess SVGs with Inkscape): pastes.io/rf5orhtvsm
With gradient:
Without gradient: