<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">
<h1 class="text-center">by Sachin</h1>
<div class="col-lg-4 col-md-4 col-sm-4 col-xs-12">
<div class="sample">
<img src="https://static.pexels.com/photos/33045/lion-wild-africa-african.jpg" alt="sample" />
<span class="top"></span>
<span class="right"></span>
<span class="bottom"></span>
<span class="left"></span>
</div>
</div>
<div class="col-lg-4 col-md-4 col-sm-4 col-xs-12">
<div class="sample">
<img src="https://static.pexels.com/photos/33045/lion-wild-africa-african.jpg" alt="sample" />
<span class="top"></span>
<span class="right"></span>
<span class="bottom"></span>
<span class="left"></span>
</div>
</div>
<div class="col-lg-4 col-md-4 col-sm-4 col-xs-12">
<div class="sample">
<img src="https://static.pexels.com/photos/33045/lion-wild-africa-african.jpg" alt="sample" />
<span class="top"></span>
<span class="right"></span>
<span class="bottom"></span>
<span class="left"></span>
</div>
</div>
<div class="col-lg-4 col-md-4 col-sm-4 col-xs-12">
<div class="sample">