System refuses to accept correct solution

Hello. As you can see on the image below h2 tag has blue color but still system refuses to accept my solution.

Your code so far

h2 {
  color: blue;

<p>Click here to view more <a href="#">cat photos</a>.</p>

<a href="#"><img src="" alt="A cute orange cat lying on its back."></a>

  <p>Things cats love:</p>
    <li>cat nip</li>
    <li>laser pointers</li>
  <p>Top 3 things cats hate:</p>
    <li>flea treatment</li>
    <li>other cats</li>

<form action="">
  <label><input type="radio" name="indoor-outdoor" checked> Indoor</label>
  <label><input type="radio" name="indoor-outdoor"> Outdoor</label><br>
  <label><input type="checkbox" name="personality" checked> Loving</label>
  <label><input type="checkbox" name="personality"> Lazy</label>
  <label><input type="checkbox" name="personality"> Energetic</label><br>
  <input type="text" placeholder="cat photo URL" required>
  <button type="submit">Submit</button>

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:84.0) Gecko/20100101 Firefox/84.0.

Challenge: Use CSS Selectors to Style Elements

Link to the challenge:

Hey there @abyrwalg!

Your code passes for me, have you tried restarting your browser or using a different browser? I’m using the Chromium version of Microsoft Edge so maybe try using Google Chrome or some browser that runs on chromium?

Hope this helped!

It worked in Chrome, thank you. I was using Firefox previously.

You may need to update your Firefox. It’s also possible that you had an extension running that modifies the CSS of websites or blocks freeCodeCodeCamp’s scripts from running.

I am using the latest version of Firefox (84.0.2) and no CSS extensions. I also previously managed to complete 10 or so lessons in Firefox without any issues. It’s only this particular one gives me trouble.