Layers CSS – Responsive CSS Framework For The Structure
Layers CSS is a lightweight CSS framework that doesn’t emphasize any designs but handles the main structure.
It has support for responsive layouts with fluid grids and simple classes are used for dealing with them.
There are styles for forms, tables, lists and more but no colors or rounded-corners, customization is totally up to you.
Layers also comes with handy “everyday-use-styles” for clear, floats or hiding.