With this proloader element template is also using Nprogress bar. You can see demo on page load.
Nprogress Docs<div class="preloader-wrapper small active">
<div class="spinner-layer spinner-blue-only">
<div class="circle-clipper left">
<div class="circle"></div>
</div>
<div class="gap-patch">
<div class="circle"></div>
</div>
<div class="circle-clipper right">
<div class="circle"></div>
</div>
</div>
</div>