<link href="//netdna.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<div class="container">
<div class="row">
<section class="section_0">
<div class="col-sm-3">
<div class="circle circle1">
<a href="#section_1"><h2>1<small>st</small><p>Title</p></h2></a>
</div>
</div>
<div class="col-sm-3">
<div class="circle circle2">
<a href="#section_2"><h2>2<small>nd</small><p>Title</p></h2></a>
</div>
</div>
<div class="col-sm-3">
<div class="circle circle3">
<a href="#section_3"><h2>3<small>rd</small><p>Title</p></h2></a>
</div>
</div>
<div class="col-sm-3">
<div class="circle">
<a href="#section_4"><h2>4<small>th</small><p>Title</p></h2></a>
</div>
</div>
</section>
</div>
</div>