<!DOCTYPE HTML>
<html>
<head>
<link href="http://java2s.com/style/bootstrap.min.css" rel="stylesheet">
<style>div{background:#eee;border:1px solid #DDD;}</style>
</head><!-- w ww . j ava2 s . c o m-->
<body style='margin:20px;'>
<div class="row">
<div class="col-12 col-sm-8 col-lg-8">.col-12 .col-sm-8 .col-lg-8</div>
<div class="col-6 col-sm-4 col-lg-4">.col-6 .col-sm-4 .col-lg-4</div>
</div>
<div class="row">
<div class="col-6 col-sm-4 col-lg-4">.col-6 .col-sm-4 .col-lg-4</div>
<div class="col-6 col-sm-4 col-lg-4">.col-6 .col-sm-4 .col-lg-4</div>
<div class="col-6 col-sm-4 col-lg-4">.col-6 .col-sm-4 .col-lg-4</div>
</div>
<div class="row">
<div class="col-6 col-sm-6 col-lg-6">.col-6 .col-sm-6 .col-lg-6</div>
<div class="col-6 col-sm-6 col-lg-6">.col-6 .col-sm-6 .col-lg-6</div>
</div>
</body>
</html>