Learn HTML by Building a Cat Photo App - Step 2

HTML-CSS
1

Tell us what’s happening:
Describe your issue in detail here.

Your code so far

Cat Photos

why won't this code pass 
<html>
  <body>

<!-- User Editable Region -->

    <h1>CatPhotoApp</h1>
    <h2>Cat Photos</H2>

<!-- User Editable Region -->

  </body>
</html>

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36

Challenge: Learn HTML by Building a Cat Photo App - Step 2

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2

You need lower case here