<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/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-md-12">
<div class="loader">
<div class="loader-inner">
<div class="loading one"></div>
</div>
<div class="loader-inner">
<div class="loading two"></div>
</div>
<div class="loader-inner">
<div class="loading three"></div>
</div>
<div class="loader-inner">
<div class="loading four"></div>
</div>
</div>
</div>
</div>
</div>