Responsive Web Desgine

Tell us what’s happening:
Describe your issue in detail here.
Hey I have a little problem here because I don know what i means about " Add two spaces in front of the three child elements of main" i tried everything but it keeps showing error, someone can help me with this?

Your code so far

<html>
<body>
  <h1>CatPhotoApp</h1>
  <main>
  <h2>  Cat Photos  </h2>
 <!-- TODO: Add link to cat photos -->
  <p>  Click here to view more cat photos.  </p>
  </main>
</body>
</html>
  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36

Challenge: Step 6

Link to the challenge:

Hi, your main element should have 4 spaces from start of the line, and it’s children 6.