pip install jupyterthemes

# list available themes
# can call with "jupyter-themes" or "jt" interchangeably
jt -l

# install a theme (to ~/.jupyter/custom/)
# theme names: oceans16 | grade3 | space-legos | chesterish (NEW!)
jt -t grade3

# install a theme with toolbar (-T) enabled
jt -T -t grade3

# set font (-f) and font-size (-fs) (defaults are Hack and 11)
jt -t grade3 -f Source-Code-Pro -fs 12

# restore (-r) default theme
jt -r

# enable linewrapping in code cells
jt -t grade3 -lw

# adjust size of indent unit (default=4)
jt -t grade3 -iu 6