So: 1. If you want to override any theme settings, set the `selection` value here https://gist.github.com/rovf/3f281b87baf852c83ec9ee1ca6f79e44#file-filetypes... 2. The value here https://gist.github.com/rovf/3f281b87baf852c83ec9ee1ca6f79e44#file-filetypes... only affects the theme named "Default" 3. The `tinge.conf` file is correct and the `selection` value should be used and it works for me. Now the question is why it doesn't work for you - do you have this file stored under `~/.config/geany/colorschemes`? Note that this theme is distributed with the macOS binary so you possibly still see this theme from the installation directory but not the version modified by you if you stored it under a wrong location.