Multiple classes on a div

Tell us what’s happening:

Not accepting multiple classes on a div

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="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>

<!-- 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/123.0.0.0 Safari/537.36

Challenge Information:

Learn Responsive Web Design by Building a Piano - Step 6

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The request makes reference to

black--key

However, you wrote black-key with just one dash.

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