<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet"
href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<div class="panel-group">
<div class="panel panel-default">
<div class="panel-heading">
<h3 class="panel-title">
<a data-toggle="collapse" href="#collapse1">Collapsible panel</a>
</h3>
</div>
<div id="collapse1" class="panel-collapse collapse">
<div class="panel-body">Panel text</div>
<div class="panel-footer">Panel Footer</div>
</div>
</div>
</div>
</div>
</body>
</html>
