Learn CSS Flexbox by Building a Photo Gallery - Step 4

Tell us what’s happening:
i really can’t understand why it’s wrong, so the step says i should add a div element and nest a class and give it an h1 element and a text so why i can’t move forward .

  **Your code so far**
/* file: index.html */
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Photo Gallery</title>
  <link rel="stylesheet" href="./styles.css">
</head>
<body>
<div class="header">
<h1>CSS FLEXBOX PHOTO GALLER</h1>

</div>



</body>
</html>
/* file: styles.css */

  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36

Challenge: Learn CSS Flexbox by Building a Photo Gallery - Step 4

Link to the challenge:

You are missing a letter at the end of the string. I would recommend you copy/paste strings from the instructions if possible to avoid these types of errors in the future.