Yahoo Pure is very light: http://purecss.io/ http://purecss.io/ It has components you can stick together (or not): grid, button, table etc. Also it plays nice

Yahoo Pure is very light: http://purecss.io/ http://purecss.io/ It has components you can stick together (or not): grid, button, table etc. Also it plays nice with others, it was easy to create a Bootstrap Button component, so now I can mix and match.