This repo holds a simple theme.css file for miniflux, along with screenshots to show what the theme looks like, and instructions on how to use it. This is still a work in progress, however I am sharing it at this point as it is in a useable state.
To use this catppuccin theme in an instance of miniflux, log into the miniflux application, then go to Settings > Application Settings > Custom CSS and paste the contents of theme.css into the entry box. Then hit the update button.
If you would like to customize the css further, you can either do so directly in the input box within the application, or in a text editor and then re-paste and save.
I am open to contributions to the theme, so long as they align with the catppuccin mocha style. You can also make similar styles for latte, frappe, and macchiato and submit those as pull request, or of course make your own!