It looks great, it really does, but the problem with theming things like Jupiter notebooks / labs or RStudio, is that the theming doesn't extend to the graphs (which would be unreasonable to expect and would also be in the way if they did) and so the big white plots become quite jarring against the calm dark theme.
Thank you, glad you like it. You're right about the theme not applying to the plots, I did try applying similar colours/transparency to my interactive plots (Plotly) but it was not worth the trouble in the end! Instead, I have a "preamble" cell that I always include in every notebook that sets these colours for me.