Learn CSS Variables by Building a City Skyline - Step 22

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>
  </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%;
  display: flex;
  align-items: flex-end;
  justify-content: space-evenly;
}

.bb1 {
  width: 10%;
  height: 70%;
  display: flex;
  flex-direction: column;
  align-items: center;
  --building-color1: #aa80ff;
}

.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%;
 
--building-color2: #66cc99;
    background-color: var(--building-color2);
}

 
.bb3 {
  width: 10%;
  height: 55%;
}

.bb4 {
  width: 11%;
  height: 58%;
}
    

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Challenge: Learn CSS Variables by Building a City Skyline - Step 22

Link to the challenge:

please my challenge is how I can give --building-color2 a value of #66cc99 .

just add the new variable below the one you have already

Create a new variable below the other one called --building-color2 and give it a value of #66cc99 . Then set it as the background-color of .bb2 .
please how do i carry it out

I think I already answered the question “how do i carry it out”.

You have a variable already created called --building-color1
just add the new one underneath

it is still throwing an error, telling me that
I should set the background-color using the --building-color2 variable.

did you remember to use the var function?

thanks so much , the error has been fixed