<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div class="container">
<div class="row builder">
<h2>text box example</h2>
<div class="col-md-7">
<h2>Preview</h2>
<div class="browser">
<div class="top">
<span class="dot"></span>
<span class="dot"></span>
<span class="dot"></span>
</div>
<div class="content">
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</div>
</div>
</div>
</div>
</div>
