Learn CSS Variables by Building a City Skyline - Step 15

Tell us what’s happening:
Describe your issue in detail here. Please help me with this code I am trying to Add the variable --building-color1 you created in the previous step as the value of the background-color property of the .bb1a class and its not working

Your code so far

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

    <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;

/* User Editable Region */

.bb1a {
  width: 70%;
  height: 10%;}


/* User Editable Region */

.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/ Safari/537.36

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

Link to the challenge:

You have got the order reversed, the var(--building-color1) will come after the background-color.

Css follows the following syntax:

  property: value;

In your code background-color is supposed to be the property and the var(--building-color1) is the value.

You also have an extra } bracket after the height property.

Restart the step.

Add the ‘background-color’ property set to a value of “var(–building-color1);” within .bb1a selector *right below the width and height properties:

.bba1 {
  property: value;
  property: value;
  property: value;

Thank you for your assistance

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