Learn Responsive Web Design by Building a Piano - Step 5

Tell us what’s happening:
i am confused i did exactly what was asked

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="keys"></div>
            <div class="keys"></div>
              <div class="keys"></div>
                <div class="keys"></div>
                  <div class="keys"></div>
                    <div class="keys"></div>
                     <div class="keys"></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/108.0.0.0 Safari/537.36

Challenge: Learn Responsive Web Design by Building a Piano - Step 5

Link to the challenge:

this is the .keys element you were supposed to add the divs to
please reset and try again