参考 https://github.com/dunovank/jupyter-themes
install with pip
# install jupyterthemes
pip install jupyterthemes
# upgrade to latest version
pip install --upgrade jupyterthemes
查看有哪些主题
jt -l
更换某主题
jt -t grade3
# 更换主题和字体
jt -f inconsolata -t grade3
恢复默认主题
jt -r