<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>
<div class="container">
<div class="row">
<div class="panel panel-primary">
<div class="panel-heading">
<h3 class="panel-title">Background image's with responsive utilities</h3>
</div>
<div class="panel-body">
<p>Make your background image's file size smaller for small screens. This example loads 3x faster on mobile.</p>
<p><small>
Ref: <a href="http://getbootstrap.com/css/#responsive-utilities" target="_blank">Bootstrap's Responsive Utilities</a>
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<a href="http://msurguy.github.io/triangles/" target="_blank">Triangle Generator</a>
</small></p>
</div>
</div>
</div>
</div>
<div class="container">
<div class="row">
<div class="col-md-12">
<a class="pull-right" href="http://bootsnipp.com/iframe/80qDZ" target="_blank">full screen</a>
<hr>
<div class="visible-lg myBack-lg">
<h1>visible-lg</h1>
<p class="text-center btn-danger">
Large devices Desktops (≥1200px) - background image size = 133Kb
</p>
