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<html lang="en"><head> <title>Bootstrap Example</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script></head><body> <div class="container"> <h2>Panel Title</h2> <p>The .panel-title class is used inside a .panel-heading to adjust the styling of the text (removes margins and adds a font-size of 16px):</p> <p>With panel-title: <div class="panel panel-default"> <div class="panel-heading"> <h3 class="panel-title">Panel Heading</h3> </div> <div class="panel-body"> Panel content </div> </div> <p>Without panel-title: <div class="panel panel-default">