Bootstrap, from Twitter

Bootstrap is a toolkit from Twitter designed to kickstart development of webapps and sites.
It includes base CSS and HTML for typography, forms, buttons, tables, grids, navigation, and more.

Nerd alert: Bootstrap is built with Less and was designed to work out of the gate with modern browsers in mind.

i think i will give it a try in my next UI design.

How to use it

Use this option to make full use of Bootstrap’s Less variables, mixins, and nesting in CSS via javascript in your browser. 

             <link rel="stylesheet/less" href="less/bootstrap.less" media="all" />