<link href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<ul id="progress">
<li>
<div id="layer1" class="ball"></div>
<div id="layer7" class="pulse"></div>
</li>
<li>
<div id="layer2" class="ball"></div>
<div id="layer8" class="pulse"></div>
</li>
<li>
<div id="layer3" class="ball"></div>
<div id="layer9" class="pulse"></div>
</li>
<li>
<div id="layer4" class="ball"></div>
<div id="layer10" class="pulse"></div>
</li>
<li>
<div id="layer5" class="ball"></div>
<div id="layer11" class="pulse"></div>
</li>
</ul>
<a class="trigger" href="#">Start/Restart Animation</a>