classless is a standard for making blog-like themes that work on a more-or-less fixed HTML structure where classes are optional.
See https://classless.alhur.es/ for more information or just go to https://classless.alhur.es/themes to see the themes.
This has no relation with marx, the classless CSS reset and we think it's a crime to defend, or even make CSS jokes with, a violent and inhumane ideology that has lead to the death, poverty, starvation, torture and rape of millions of people around the globe.