Designer Jay Freestone’s argument behind this very simple set of Sass mixins to generate a grid set:
Because you’re using Libsass, which (at the time of writing) rules out the two well established SASS based grid systems, Susy and Neat. Brockmann is designed to be super lightweight and incredibly easy to understand. It’s not a comprehensive system. It’s a set of transparent and reusable mixins that let you built out a pre-conceived grid quickly.