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BOOTSTRAP

Bootstrap 

Bootstrap 3

Bootstrap is the most popular HTML, CSS, and JavaScript framework for developing responsive, mobile-first web sites.

Bootstrap is completely free to download and use!

Resources:
01 - Learn Bootstrap - http://www.w3schools.com/bootstrap/default.asp
02 - Bootstrap RTL - https://github.com/morteza/bootstrap-rtl
CDN:
<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">

<!-- jQuery library -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>

<!-- Latest compiled JavaScript -->
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>

CDN RTL:
<link rel="stylesheet" href="//cdn.rawgit.com/morteza/bootstrap-rtl/master/dist/cdnjs/3.3.1/css/bootstrap-rtl.min.css">