Learn CSS Variables by Building a City Skyline - Step 33

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></div>
     <div></div>
     <div class="bb1">
       <div class="bb1a"></div>
       <div class="bb1b"></div>
       <div class="bb1c"></div>
       <div class="bb1d"></div>
     </div>
     <div class="bb2"></div>
     <div class="bb3"></div>
     <div></div>
     <div class="bb4"></div>
     <div></div>
     <div></div>
   </div>

   <div class="foreground-buildings">
     <div class="fb1"></div>
     <div class="fb2"></div>
     <div class="fb3"></div>
     <div class="fb4"></div>
     <div class="fb5"></div>
     <div class="fb6"></div>
   </div>
 </body>
</html>
/* file: styles.css */
:root {
 --building-color1: #aa80ff;
 --building-color2: #66cc99;
 --building-color3: #cc6699;
 --building-color4: #538cc6;
}

* {
 border: 1px solid black;
 box-sizing: border-box;
}

body {
 height: 100vh;
 margin: 0;
 overflow: hidden;
}
.background-buildings{
 width: 100%;
 height: 100%;
 display: flex;
 align-items: flex-end;
 justify-content: space-evenly;
 
}

.bb1 {
 width: 10%;
 height: 70%;
 display: flex;
 flex-direction: column;
 align-items: center;
}

.bb1a {
 width: 70%;
 height: 10%;
 background-color: var(--building-color1);
}

.bb1b {
 width: 80%;
 height: 10%;
 background-color: var(--building-color1);
}

.bb1c {
 width: 90%;
 height: 10%;
 background-color: var(--building-color1);
}

.bb1d {
 width: 100%;
 height: 70%;
 background-color: var(--building-color1);
}

.bb2 {
 width: 10%;
 height: 50%;
 background-color: var(--building-color2);
}

.bb3 {
 width: 10%;
 height: 55%;
 background-color: var(--building-color3);
}

.bb4 {
 width: 11%;
 height: 58%;
 background-color: var(--building-color4);
}

.foreground-buildings {
 width: 100%;
 height: 100%;
 display: flex;
 align-items: flex-end;
 justify-content: space-evenly;
}
.background-buildings, foreground-buildings{
position: absolute;
}
.fb1 {
 width: 10%;
 height: 60%;
}

.fb2 {
 width: 10%;
 height: 40%;
}

.fb3 {
 width: 10%;
 height: 35%;
}

.fb4 {
 width: 8%;
 height: 45%;
}

.fb5 {
 width: 10%;
 height: 33%;
}

.fb6 {
 width: 9%;
 height: 38%;
}
   
   **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36

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