Hugo has great support for Markdown. It works out-of-the-box altogether. However, I like Asciidoc more so I tried to set up the platform for writing pages with lots of source code listings. It became a task for masochists. If you are okay with Markdown, you should probably stay in that realm and enjoy simplicity. I tried several approaches. None of them seemed to work for me. External CSS according to Rgielen.