Learn the CSS Box Model by Building a Rothko Painting - Step 1

Please where am I making mistake ?

  **Your code so far**
<!DOCTYPE html>
<html>
<head></head>
<body></body>
</html>

  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36

Challenge: Learn the CSS Box Model by Building a Rothko Painting - Step 1

Link to the challenge:

Your html tag needs a lang attribute, mind the hint.