Jupyter notebooks dark mode with Jupyter-themes

(1) Install it (more about installation):

pip install jupyterthemes

(2) setup the dark theme (learn more about options):

jt -t monokai -f fira -fs 13 -nf ptsans -ofs 12 -nfs 11 -N -kl -cursw 5 -cursc r -cellw 95% -T