Learn Responsive Web Design by Building a Piano - Step 6

Tell us what’s happening:
Describe your issue in detail here.
I have added the second class in all the ways that i could and i can’t figure out why it’s not working.
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" class='black--key'></div>
        <div class="key" class='black--key'></div>
        <div class="key"></div>
        <div class="key" class='black--key'></div>
        <div class="key" class='black--key'></div>
        <div class="key" class='black--key'></div>
      </div>
    </div>
  </body>
</html>
/* file: styles.css */

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User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:105.0) Gecko/20100101 Firefox/105.0

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

Link to the challenge:

Check the examples here:

<p>Narrator: This is the beginning of the play.</p>

<p class="note editorial">Above point sounds a bit obvious. Remove/rewrite?</p>

<p>Narrator: I must warn you now folks that this beginning is very exciting.</p>

<p class="note">[Lights go up and wind blows; Caspian enters stage right]</p>

you must not create a second class attribute
just put the classes in the same attribute with a single space in between

got it thank you for the help

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