<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<div class="container">
<div class="row">
<div class="col-sm-3" style="background-color:lavender;">.col-sm-3</div>
<div class="col-sm-6" style="background-color:lavenderblush;">.col-sm-6</div>
<div class="col-sm-3" style="background-color:lavender;">.col-sm-3</div>
</div>
