Quarto reveal.js presentations are readily themeable and highly customizable. I wanted to use the accessible Aktinson Hyperlegible font, which took me into the world of *.scss files. It turned out almost trivial: a few lines to overrule the font of the themes, and a tiny change in the YAML header.
Custom *.scss file available on GitHub: https://github.com/druedin/atkinson_quarto
Didier Ruedin 