How can I change the font size?

[aolega]

No description provided.

[mikepierce]

There are a bunch of different font sizes you could change. Run !jt -h to see the options

[TheDangerD0802]

First, install jupyter themes:
[pip install jupyterthemes]

set font/font-size of markdown (text cells) and notebook (interface)
see sans-serif & serif font tables below
[ jt -tf merriserif -tfs 10 -nf ptsans -nfs 13 ]

For other options use : [jt -h]