<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://apps.bdimg.com/libs/bootstrap/3.3.0/css/bootstrap.min.css">
<script src="https://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script>
<script src="https://apps.bdimg.com/libs/bootstrap/3.3.0/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>Example</h2>
<p>The .close class indicates a close icon.</p>
<div style="padding:50px;width:400px;background-color:#f1f1f1;">
<span>The close icon floats to the right:</span>
<button type="button" class="close"><span aria-hidden="true">×</span><span class="sr-only">Close</span></button>
</div>
</div>
</body>
</html>