Flexbox Equal Height Columns
Full view (4 cols): http://codepen.io/jlantunez/full/wMLJYv
Editor: http://codepen.io/jlantunez/pen/wMLJYv
Full view (4 cols): http://codepen.io/jlantunez/full/wMLJYv
Editor: http://codepen.io/jlantunez/pen/wMLJYv