Jupyter notebook theme and customization

Jeremy, what theme and/or customization(s) do you use for the Juypter notebook? The default theme is ugly IMHO, and your setup is quite simplistic yet productive. The closest I could find was this.
Could you please post your theme and/or the customization(s) that you have configured? Thank you.

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I use the theme thingie that you linked to, and the collapsible headings extension (search the forum for details).