Rather than reinvent the wheel, we've integrated the best open-source responsive framework into Kartris. Zurb's Foundation provides many useful tools, and is proven on thousands of high-profile web sites across the world.

For more information see http://foundation.zurb.com/

Because Foundation is integrated into Kartris, you can use all its built-in features in your content without needing to fiddle with any javascript. For example, you can easily create lightboxes, slideshows, hover buttons, dropdown menus, tooltips, sticky navigation in either your skins, or your site content, with just some simple HTML. And because Foundation is designed to be responsive, your content will automatically be mobile-friendly.

For an overview of the various Foundation features, see the documentation: http://foundation.zurb.com/docs/