Learn HTML by Building a Cat Photo App - Step 1

HTML-CSS
#1

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

Why am I not getting the code correctly

<html>
 <CatPhotoApp></CatPhotoApp>
    <h1>Hello World</h1>
  </body>
</html>

Your browser information:

User Agent is: Mozilla/5.0 (iPhone; CPU iPhone OS 14_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/105.0.5195.129 Mobile/15E148 Safari/604.1

Challenge: Learn HTML by Building a Cat Photo App - Step 1

Link to the challenge:

#2

Hello, Try to review the link below to see if it will help.
If you are still stuck after that please respond back to me with your newest code.