How to change fonts in Kod?

Locate the Kod application bundle (e.g. /Applications/Kod.app) and Show Package Contents.

Navigate to /Contents/Resources/style/ and copy default.css to your desktop. Rename the file to kod.css.

Open Terminal and enter the following command:

defaults write se.hunch.kod style/url ~/Desktop/kod.css

Open the kod.css file in an editor and change the font-size attribute of body to change text size. font-family determines which font is used.

If Kod is running, select View » Reload Style.

Enjoy.

^{Store your modified CSS file anywhere you want. Desktop is just an example -- just remember to tell Kod via defaults where it's located.}