Learn CSS Variables by Building a City Skyline - Step 15

Tell us what’s happening:

I cant seem to figure out how to write out the var code, it keeps coming up as code 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 { var(--building-color1 background-color:#999);
  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 Edg/117.0.2045.60

Challenge Information:

Learn CSS Variables by Building a City Skyline - Step 15

Here’s how variables in CSS work.

They hold a value for and give you a name to reference. In the last challenge, you assigned “#999” to --building-color1.

To retrieve and use that variable, you use the following syntax.


You then assign your CSS property like background-color to that variable, and boom. It works the same way as if you did a literal assignment; only that you only need to update it in the one spot.

Hope this helps. Happy coding. :slight_smile:


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