Learn Responsive Web Design by Building a Piano - Step 7

Tell us what’s happening:
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 black--key"></div>
        <div class="key black--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 (Linux; U; Android 11; SM-A022F Build/RP1A.200720.012; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/104.0.5112.97 Mobile Safari/537.36 OPR/65.0.2254.63211

Challenge: Learn Responsive Web Design by Building a Piano - Step 7

Link to the challenge:

The instruction: " Now copy the set of seven .key elements, and paste two more sets into the .keys div." Copy all div elements between ‘class="keys’" div tags, and paste it two times. You should have 21 (3 sets of 7 ‘div’ elements).