I can't find the answer

Tell us what’s happening:
It asks me for 21 .key elements, I have done it in various ways including adding the two extra .keys elements and nothing

  **Your code so far**
/* file: index.html */
<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8" />
  <title>Piano</title>
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
</head>
<body>
  <div id="piano">
    <div class="keys">
      <div class="key black--key"></div>
      <div class="key black--key"></div>
      <div class="key"></div>
      <div class="key"></div>
      <div class="key"></div>
      <div class="key"></div>
      <div class="key"></div>
      <div class="key"></div>
      <div class="key"></div>
      <div class="key"></div>
      <div class="key"></div>
      <div class="key"></div>
      <div class="key"></div>
      <div class="key"></div>
      <div class="key"></div>
      <div class="key"></div>
      <div class="key"></div>
      <div class="key black--key"></div>
      <div class="key black--key"></div>
      <div class="key black--key"></div>
    </div>
  </div>
</body>
</html>
/* file: styles.css */

  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.5060.114 Safari/537.36

Challenge: Step 7

Link to the challenge:

I would restart the step to get the original HTML back. You want to copy the 7 key divs that are there and then paste them into the HTML twice right below the original seven. So in the end you should have 3 sets of 7 key divs and they should all look exactly the same.