My code is not working, tried severally

Tell us what’s happening:
Describe your issue in detail here.
I don’t know what I’m getting wrong

  **Your code so far**
\ file: <!DOCTYPE html>
<html>
<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"></div>
    </div>
  </div>
</body>
</html>
<!DOCTYPE html>
<html>
<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"></div>
    </div>
  </div>
</body>
</html>
\ file: 

  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.127 Safari/537.36 Edg/100.0.1185.50

Challenge: Step 6

Link to the challenge:

I dont think this is the first time you add multiple class.
This is an example with multiple classes:

<p class="red-text bold"></p>

/* The Syntax: */
<element class="class1 class2"></element>

The correct way to introduce multiple class is by including a space in between both class names. Your class names were separated by (–) which is incorrect:

/* Correct Syntax: */
<div class="key" class="black key"></div>

Now thats wrong, the class name itself is black--key. Please make sure you give the right info before posting .


Your syntax is wrong too

The class attribute is not used twice.
Maybe you didn’t see the other class?