Learn Responsive Web Design by Building a Piano - Step 6

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Describe your issue in detail here.

  **Your code so far**
/* file: index.html */
<!DOCTYPE html>
<html lang="en">
<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"</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>
  </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/103.0.0.0 Safari/537.36

Challenge: Learn Responsive Web Design by Building a Piano - Step 6

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Am trying the following without success
Remember that a class attribute can have multiple values. To separate your white keys from your black keys, you’ll add a second class value of black--key . Add this to your second, third, fifth, sixth, and seventh .key elements.