.show,.hidden classes are used to show and hide the paragraph text.
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Bootstrap css helpers Example</title>
<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<div class="well">
<p>The .show class forces an element to be shown:</p>
<p class="show">This paragraph is forced to be shown.</p>
<p>The .hidden class forces an element to be hidden:</p>
<p class="hidden">This paragraph is forced to be hidden.</p>
</div>
</div>
</body>
</html>
