The zen and zen-based themes are very customizable, so to make these themes work, you have to use the sample config file. The theme uses Font Awesome v5 icons. More info about the zen themes family [here](http://www.damian.oquanta.info/posts/nikolas-zen-theme-finally-released.html). Enjoy! Damián **WARNING:** The themes use Less for their styles, but you don't need a Less compiler installed to use it.