JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<body>

<h1>Hello, world!</h1>

    <div class="alert alert-success">
    <!-- you missed this line of code -->
      <a href="#" class="close" data-dismiss="alert" aria-label="close">&times;</a>
      <strong>Success!</strong> Bootstrap applied to alert.
    </div>

<div style = "padding: 10px 10px 10px;">
   <form class = "bs-example bs-example-form" role = "form">
      <div class = "input-group">
         <span class = "input-group-addon">$</span>
         <input type = "text" class = "form-control" placeholder = "Amount">
         <span class = "input-group-addon">.00</span>
      </div>
   </form>
</div>

</body>