Not sure where else to put this, but may be of use to someone else who’s working on a theme or code-centered site. I’ve just created a repo of Base16 drop-in templates for Hugo:
If you’ve already got Hugo configured with pygmentsUseClasses = true you’re most of the way there; you just have to download / copy one of the pre-built CSS files into your site and it should just work.
They’re formatted to be identical to the ones Chroma generates, so at the very least they can give you some ideas for your own styling.