Learn Responsive Web Design by Building a Piano - Step 6

HTML-CSS
1

Tell us what’s happening:
Would someone please help me figure out what’s going on here? No matter how I tried this code, it does work. To my knowledge, I have followed the instruction provided.

Screenshot (6)
Screenshot (6)1366×768 114 KB

This is the result that I get:
Screenshot (7)
Screenshot (7)1366×768 106 KB

Thank you.

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>

<!-- User Editable Region -->

    <div id="piano">
      <div class="keys">
       <div class="key"></div> 
       <div class="black--key"></div>
        <div class="black--key"></div>
        <div class="key"></div>
        <div class="black--key"></div>
        <div class="black--key"></div>
        <div class="black--key"></div>
      </div>
    </div>

<!-- User Editable Region -->

  </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/109.0.0.0 Safari/537.36 Edg/109.0.1518.61

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

Link to the challenge:

2

There should be two values for the class for the black key divs, not one.