Creating a user style for an application that is used to create user styles in, feels a bit like creating a circular reference. In Excel that would be like entering the function =if(A1="";"empty cell";A1)
in cell A1.


Simple dark mode for Stylus, edit screen
However, it turns out that Stylus doesn't care about circular references, so I created a Dark Mode user style for Stylus. This style also includes a Dark Mode for the user styles management page.


Simple dark mode for Stylus, user styles management screen
If there is anything I overlooked, please let me know by leaving a comment below.
Edit: In the meantime I wrote a more complete dark theme for Stylus that you can read about in 'User style: 1973 prism, the Dark Side of Stylus'.