style in html not working 

My data html 
```
 <body>
  <div style="display: flex; justify-items: center; align-items: center;height: 100%;width: 100%;">
    <div style="width: 100%;text-align: center;">
      <img src="https://www.professionalservicesllc.com/clients/stoneledge/images/loaders/updating.gif" />
    </div>
  </div>
</body>
```
Web browser good working. pls help.