jupyterlab - change styling - font, font size

Question

I recently updated to the most recent version of JupyterLab (0.28.12). I'm on Windows.

I've tried adjusting the variables.css file located in \Lib\site-packages\jupyterlab\themes\@jupyterlab\theme-light-extension of my Miniconda/Anaconda folder. I mainly want to change the font family and size, which I've tried using the variables.css file. However, I can't see any changes.

I went to the extreme point of deleting both theme folders, but still I can change themes without a problem through the Lab interface.

Where are the JupyterLab theme .css files located? Or how can I find them? I've searched for css files and the themes sub folder seems to be the only location for them. I can't seem to find any in my user directory either c:\Users\User\.jupyter where the .css files were for Jupyter Notebook were located.

Thanks!

Answer 1

I am running version 0.35.4 right now on Ubuntu and it is possible to edit the fonts in the Settings->Advanced Settings Editor, selected from the top bar menu.

There are a number of options that can be set by changing the json strings in the Raw View. See the picture below:

Answer 2

From http://jupyterlab.readthedocs.io/en/latest/user/extensions.html?highlight=themes :

• The themes directory contains assets (such as CSS and icons) for JupyterLab theme extensions.
• The themes directory is located in the JupyterLab application directory which defaults to <sys-prefix>/share/jupyter/lab, where <sys-prefix> is the site-specific directory prefix of the current Python environment. You can query the current application path by running jupyter lab path.