It's just colour schemes:
Retro groove color scheme for Vim. Contribute to morhetz/gruvbox development by creating an account on GitHub.
github.com
😸 Soothing pastel theme for the high-spirited! Contribute to catppuccin/catppuccin development by creating an account on GitHub.
github.com
The gruvbox theme feels more "comfortable" to read, at least for me. I don't have a Xenforo instance running here, and to be honest I have no idea on how to make it work lmao.
Maybe downloading this page as HTML and then editing the CSS using Xenforo's classes might do the work, but first I'll see if I can run Xenforo locally on my machine.