<!DOCTYPE html>
<html>
  <head>
    <script
      crossorigin="anonymous"
      src="https://cdn.botframework.com/botframework-webchat/latest/webchat.js"
    ></script>
    <style>
      html,
      body {
         height: 100%;
      }

      body {
        margin: 0;
      }

      #webchat {
        height: 100%;
        width: 100%;
      }
    </style>
  </head>
  <body>
    <div id="webchat" role="main"></div>
    <script>
      window.WebChat.renderWebChat(
        {
          directLine: window.WebChat.createDirectLine({
            token: 'YOUR_DIRECT_LINE_TOKEN'
          }),
          userID: 'YOUR_USER_ID',
          username: 'Web Chat User',
          locale: 'en-US'
        },
        document.getElementById('webchat')
      );
    </script>
  </body>
</html>