One test cases not passing for display:flex

I was working on https://learn.freecodecamp.org/responsive-web-design/css-flexbox/add-flex-superpowers-to-the-tweet-embed problem.

The test case that is not passing is Your .follow-btn should have a display property set to flex.

I think i have implemented it but it is not getting detected, please help !

Hello
The button element don’t figure out in the rendered page at the right.
verify the presence of this element in your header section below the profile name division:

  <div class="follow-btn">
    <button>Follow</button>
  </div>

good luck

This element is there.

This code pass all tests for me :

<style>
  body {
    font-family: Arial, sans-serif;
  }
  header {
    display: flex;
  }
  header .profile-thumbnail {
    width: 50px;
    height: 50px;
    border-radius: 4px;
  }
  header .profile-name {
    display: flex;
    margin-left: 10px;
  }
  header .follow-btn {
    display:flex;
    margin: 0 0 0 auto;
  }
  header .follow-btn button {
    border: 0;
    border-radius: 3px;
    padding: 5px;
  }
  header h3, header h4 {
    display: flex;
    margin: 0;
  }
  #inner p {
    margin-bottom: 10px;
    font-size: 20px;
  }
  #inner hr {
    margin: 20px 0;
    border-style: solid;
    opacity: 0.1;
  }
  footer {
    display: flex;
  }
  footer .stats {
    display: flex;
    font-size: 15px;
  }
  footer .stats strong {
    font-size: 18px;
  }
  footer .stats .likes {
    margin-left: 10px;
  }
  footer .cta {
    margin-left: auto;
  }
  footer .cta button {
    border: 0;
    background: transparent;
  }
</style>
<header>
  <img src="https://pbs.twimg.com/profile_images/378800000147359764/54dc9a5c34e912f34db8662d53d16a39_400x400.png" alt="Quincy Larson's profile picture" class="profile-thumbnail">
  <div class="profile-name">
    <h3>Quincy Larson</h3>
    <h4>@ossia</h4>
  </div>
  <div class="follow-btn">
    <button>Follow</button>
  </div>
</header>
<div id="inner">
  <p>I meet so many people who are in search of that one trick that will help them work smart. Even if you work smart, you still have to work hard.</p>
  <span class="date">1:32 PM - 12 Jan 2018</span>
  <hr>
</div>
<footer>
  <div class="stats">
    <div class="Retweets">
      <strong>107</strong> Retweets
    </div>
    <div class="likes">
      <strong>431</strong> Likes
    </div>
  </div>
  <div class="cta">
    <button class="share-btn">Share</button>
    <button class="retweet-btn">Retweet</button>
    <button class="like-btn">Like</button>
  </div>
</footer>

Our code is almost same, only difference is I have a background color of coral that’s the only difference.
I tried to test with your code as well still getting same error.