I present an Open Source, versioned, linted set of CSS rules for reverting Gmail to the theme that was so forcefully taken away from us. Change is hard, and sometimes change rubs like coarse sandpaper. I wasn't and still am not a fan of the new design, so I put this together after not finding a well-rounded complete solution. And that's what this aims to be. There are surely quirks that haven't been adjusted, and if you see some, please open an Issue (preferably with a screenshot) so this can be improved.