Header .follow-btn dont accept display:flex;

<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://freecodecamp.s3.amazonaws.com/quincy-twitter-photo.jpg" 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>

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I’m also having trouble with this challenge.
Here’s what I have in my code:

  header .follow-btn {
    display: flex;
    margin: 0 0 0 auto;
  }

…and this is apparently the official solution:

  header .follow-btn {
    display: flex;
    margin: 0 0 0 auto;
  }

…but it’s not accepting that as the right answer. Six of the seven answers are apparently correct, this is the only one it’s getting hung up on. So, I guess this is more of an error report than a question.

if you have an ad block the follow button is hidden and the tests not pass

And that did it. I would have been chasing my tail all day over that.