We can make a panel more meaningful to a particular context by adding any of the contextual state classes.
<!DOCTYPE HTML>
<html>
<head>
<link href="http://java2s.com/style/bootstrap.min.css" rel="stylesheet">
<!-- ww w.j a v a2s . com-->
<script src="http://java2s.com/style/jquery-1.8.0.min.js"></script>
<script src="http://java2s.com/style/bootstrap.min.js"></script>
</head>
<body style='margin:20px;'>
<div class="panel panel-primary">
<div class="panel-heading">
<h3 class="panel-title">Panel title</h3>
</div>
Panel content
</div>
<div class="panel panel-success">
<div class="panel-heading">
<h3 class="panel-title">Panel title</h3>
</div>
Panel content
</div>
<div class="panel panel-warning">
<div class="panel-heading">
<h3 class="panel-title">Panel title</h3>
</div>
Panel content
</div>
<div class="panel panel-danger">
<div class="panel-heading">
<h3 class="panel-title">Panel title</h3>
</div>
Panel content
</div>
<div class="panel panel-info">
<div class="panel-heading">
<h3 class="panel-title">Panel title</h3>
</div>
Panel content
</div>
</body>
</html>