If you are using Redcarpet, you will definitely want to also add Rouge!

Text version: https://blog.corsego.com/markdown-styling-with-rouge

Episode Source Code: https://github.com/corsego/72-gem-rouge/commit/6c2b27eaf3cc951b32ae6099602544c724446a9a

Gem Rouge: https://github.com/rouge-ruby/rouge

0:00 Intro
1:13 Install Gem Rouge
4:25 Rouge CSS Themes
6:16 WORKS. WHY?
6:48 Customize CSS Theme