The Flex Grid System is a css grid system designed specifically for responsive (flexing) sites. It's semantic, easy to use and customize, and very flexible (get it?).
Increased productivity, powerful features. Rapid prototyping, uniform margins, easy page layout, layout variations in CMSs... the list goes on. In fact, grids can be used in pretty much any site. Trust me, they'll make your life easier. In fact, this page is using Flex Grids right now!
<div class="grid"> <div class="sm-twelve md-three columns">Element 1</div> <div class="sm-twelve md-three md-offset-by-three columns">Element 2</div> <div class="sm-twelve md-three columns">Element 3</div> </div>