The Quark theme has the ability to allow pages to override some of the default options by letting the user set body_classes for any page. The theme will merge the combination of the defaults with any body_classes set. This allows you to easily add hero classes to give your blog post some bling.

The Quark theme is the new default theme for Grav built with Spectre.css the lightweight, responsive and modern CSS framework. Spectre provides basic styles for typography, elements, and a responsive layout system that utilizes best practices and consistent language design.