why i can't pass Create a Bootstrap Row, pls help?

[sunshine]

Challenge Create a Bootstrap Row has an issue.
User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Firefox/68.0.
Please describe how to reproduce this issue, and include links to screenshots if possible.

My code:

<div class="container-fluid">
  <h3 class="text-primary text-center"><div class = "row">jQuery Playground</div></h3>

</div>