Learn Responsive Web Design by Building a Piano - Step 6

Tell us what’s happening:
Describe your issue in detail here.
please how do add two class attributes
Your code so far

<!-- file: index.html -->
<!DOCTYPE html>
<html lang="en">
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <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>
/* file: styles.css */

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User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/ Safari/537.36

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

Link to the challenge:

do not repeat the word class
instead write it like this:
class="one two three"
this sample shows you a class attribute that has 3 classes called one, two and three

its asking for the value number

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