Add your variable as the value of the background-color property of the .bb1a class

Tell us what’s happening:
Describe your issue in detail here.

  **Your code so far**
/* file: index.html */
<!DOCTYPE html>
  <title>City Skyline</title>
  <link href="styles.css" rel="stylesheet" type="text/css" />   

  <div class="background-buildings">
    <div class="bb1">
      <div class="bb1a"></div>
      <div class="bb1b"></div>
      <div class="bb1c"></div>
      <div class="bb1d"></div>
/* 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 { var(--building-color1); width: 70%;
height: 10%;}
.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; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.67 Safari/537.36 OPR/87.0.4390.45

Challenge: Step 15

Link to the challenge:

Currently, var(--building-color1) is not added to any property. You need to add it to background-color property.

How do i add var(–building-color1) to background-color property, please?

add a background-color property to the .bb1a selector and give it the value: var(–building-color1);

Apologies but…
Still clueless about what i’m doing!
haven’t been able to move forward in days
Please help!!!

var(–building-color1); .bb1a{background-color:#999; width: 70%;
height: 10%;}


background-color: var(–building-color1);

to the.bb1a selector in CSS.

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