Learn CSS Variables by Building a City Skyline - Step 10

Tell us what’s happening:
I don’t get it isn’t .bb1 a class selector what am I doing wrong ?
Describe your issue in detail here.

Your code so far

<!-- file: index.html -->
<!DOCTYPE html>
<html lang="en">    
  <head>
    <meta charset="UTF-8">
    <title>City Skyline</title>
    <link href="styles.css" rel="stylesheet" />
  </head>

  <body>
.bb1

    <div class="background-buildings"></div>
    <div class="bb1"> </div>

}

  </body>
</html>
/* file: styles.css */
* {
  border: 1px solid black;
  box-sizing: border-box;
}

body {
  height: 100vh;
  margin: 0;
  overflow: hidden;
}

.background-buildings {
  width: 100%;
  height: 100%;
}
    

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36

Challenge: Learn CSS Variables by Building a City Skyline - Step 10

Link to the challenge:

Open your styles.css file, and give .bb1 a width of 10% and height of 70%

You did not follow this instruction.

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