<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> <!------ Include the above in your HEAD tag ----------> <div class="container"> <div class="row"> <div class="wrap"> <div class="abajo"></div> <div class="arriba"></div> </div> </div> </div>

.abajo {width: 300px; height: 300px} .arriba {width: 200px; height: 200px} .abajo {background: blue; position: absolute;} .arriba {background: red; position: relative; } .wrap {width: 300px; height: 300px; margin: 0 auto;}