Learn CSS Variables by Building a City Skyline - Step 15

Tell us what’s happening:
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>
   <div class="background-buildings">
     <div class="bb1">
       <div class="bb1a"></div>
       <div class="bb1b"></div>
       <div class="bb1c"></div>
       <div class="bb1d"></div>
     </div>
   </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%;
}

.bb1 {
 width: 10%;
 height: 70%;
 display: flex;
 flex-direction: column;
 align-items: center;
 --building-color1: #999;
}
.bb1a {
 width: 70%;
 height: 10%;
 var(--building-color1-background-color:.bb1a);
 
}
.bb1b {
 width: 80%;
 height: 10%;
}

.bb1c {
 width: 90%;
 height: 10%;
}

.bb1d {
 width: 100%;
 height: 70%;
}
   
   **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36

Challenge: Learn CSS Variables by Building a City Skyline - Step 15

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