Highlight code and syntax with Prettify
Open your Docs site settings and scroll to the bottom of the page. In the Custom code section, paste the following code into the Insert <head> Code textarea:
We include the default Prettify stylesheet, but you can alternatively use your own CSS or one of their themes.
<code>tags to enable syntax highlighting. You can also enable language hints and line numbering using classes that are covered in the Prettify Getting Started documentation.