This is my port of the Material Darker theme for JupyterLab. It's a work in progress.
The extension has now been updated to support JupyterLab 3.x.
jupyter labextension install @oriolmirosa/jupyterlab_materialdarker
or directly from PyPi:
pip install jupyterlab_materialdarker
After launching JupyterLab, select the
Material Darker theme from the main menu:
JupyterLab Theme >