What is Ark?
Ark is a Sass based toolkit, designed for responsive front-end development. It leverages Sass' @extend and %placeholder classes to keep output to a minimum, while providing the developer a full range of tools. It comes complete with responsive grids, box model and visibility helpers, and more.
The tools come with breakpoint-based modifiers, that allow you to create completely responsive widgets, modules, and more without having to write media queries over and over.