pip install jupyterthemes

# list available themes
# oceans16 | grade3 | chesterish | onedork
jt -l

# select theme...
jt -t chesterish

# toggle toolbar ON and notebook name ON
jt -t grade3 -T -N

# set code font to 'Roboto Mono' 12pt
# (see monospace font table below)
jt -t oceans16 -f roboto -fs 12

# set code font to Fira Mono, 11.5pt
# 3digit font-size gets converted into float (115-->11.5)
jt -t grade3 -f fira -fs 115

# set text-cell/markdown and notebook fonts
# (see sans-serif & serif font tables below)
jt -t onedork -tf georgiaserif -nf droidsans

# adjust cell width, line-height of codecells
jt -t chesterish -cellw 900 -lineh 170

# fix the container-margins on the intro page (defaults to 'auto')
jt -t onedork -m 200

# adjust cursor width (in px) and make cursor red (r)
# options: b (blue), o (orange), r (red), p (purple), g (green)
jt -t grade3 -cursc r -cursw 5

# toggle toolbar ON and notebook name ON
jt -t grade3 -T -N

# choose alternate txt/markdown layout (-alt)
# and alternate cell prompt (narrow, no numbers)
jt -t grade3 -alt -altp

# restore default theme
jt -r