參考 https://github.com/dunovank/jupyter-themes
install with pip
# install jupyterthemes
pip install jupyterthemes
# upgrade to latest version
pip install --upgrade jupyterthemes
查看有哪些主題
jt -l
更換某主題
jt -t grade3
# 更換主題和字體
jt -f inconsolata -t grade3
恢復默認主題
jt -r