popup.html

<!doctype html>
<html>
  <head>
    <title>Website not Supported</title>
    <script src="popup.js"></script>
    <link rel="stylesheet" href="popup.css">
  </head>  
  <body>
    <div>
      <h1>Website Not Supported</h1>
      <h2>(but you can still send it a request!)</h2>
      <p>This website is not in our database, but you can still send it a request. You will need to provide the name of the organization, and a relevant email address. </p>
      <p>You can usually find these on the website's Privacy Policy, Terms and Conditions or Contact pages.</p>
      <button id="sendRequest">Send a Request!</button>
    </div>
  </body>
</html>