Bootstrap is an open-source toolkit for front-end development. It was developed by Twitter designer Mark Otto and Jacob Thornton. It is a CSS/HTML framework. Bootstrap provides elegant HTML and CSS specifications, which are written by the dynamic CSS language Less.
Bootstrap contains a wide range of Web components. Based on these components, you can quickly build a beautiful and fully functional website. It includes the following components: drop-down menu, button group, button drop-down menu, navigation bar, navigation bar, breadcrumb, paging, layout, thumbnail, warning dialog box, progress bar, and media object. Bootstrap comes with 13 jQuery plug-ins that give "life" to the components in Bootstrap ". This includes the mode dialog box, tabs, scroll bars, and pop-up boxes.
Bootstrap reference manual in English, http://getbootstrap.com/
Bootstrap Chinese Reference Manual at http://v3.bootcss.com/
Subject: http://bootswatch.com/