Exercise:

Use contextual classes to make the first item green, the second item yellow and the third red.

Hint: .list-group-item-success etc.

<!DOCTYPE html>
<html lang="en">
<head>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="../../maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="../../ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script src="../../maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>

<div class="container">
  <ul class="list-group">
    <li class="list-group-item list-group-item-success">First item</li>
    <li class="list-group-item list-group-item-warning">Second item</li>
    <li class="list-group-item list-group-item-danger">Third item</li>
  </ul>
</div>

</body>
</html>