Embedding FluentUI

<!DOCTYPE html> 
<html> 
<head> 
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script> 
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script> 
<script src="https://static2.sharepointonline.com/files/fabric/office-ui-fabric-js/1.4.0/js/fabric.min.js"></script> 
<link rel="stylesheet" href="https://static2.sharepointonline.com/files/fabric/office-ui-fabric-js/1.4.0/css/fabric.min.css" /> 
<link rel="stylesheet" href="https://static2.sharepointonline.com/files/fabric/office-ui-fabric-js/1.4.0/css/fabric.components.min.css" /> 
</head> 

<body> 
<div id="app"> 
<button class="ms-Button" style="min-width:400px" > 
  <span class="ms-Button-label">Some Text</span> 
</button> 
</div> 
</body> 
</html>