https://github.com/davepinch/pinchy.cc/blob/master/content/live-stream/configuration/set-font-size-for-optimal-visibility during the stream.md
A quick note on font size: you have to make your text editor font quite large to make it legible for your viewers! It will take a little while to get used to this. I use 26-point font in my editor, which provides only about 30 visible horizontal lines of code.