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You can install custom CSS somewhere in your .jupyter directory. Of course, this feature is undocumented and different from the analogous (documented) ipython feature.

Check this, it might be helpful for you https://github.com/merqurio/jupyter_themes

try Beaker: http://BeakerNotebook.com we have a modern interface & the next release will have a dark color theme too, easily accessible from a menu item: https://twitter.com/beakernotebook/status/682233629460795393

I've heard it a few times on HN (are you its dev?). Can you name so advantages of Beaker over Jupyter?

1) modern interface 2) polyglot architecture (multiple languages work together in the same notebook) 3) native electron version

yes i am one of its developers.

here's an example of working with Python and D3/JavaScript together: https://pub.beakernotebook.com/#/publications/560c9f9b-14e6-...

and the electron version: https://github.com/twosigma/beaker-notebook/wiki/Electron-Be...