Learn CSS Variables by Building a City Skyline - Step 15

Tell us what’s happening:

This is too confusing for me, what am I supposed to do next?

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%;
  var(--background-color1)--building-color1: #999;


/* 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 Information:

Learn CSS Variables by Building a City Skyline - Step 15

What if the instructions said to add the color black to the background-property? How would you do that? You’d follow the same pattern as adding any other property:

name: value;

Where name is the name of the property (background-color in this case) and value is the value you want to give it (black in this case). If that makes sense, then I think you can easily do this step, because that is all you are doing here, except instead of using black for the value you are using the --building-color variable.

1 Like

Ive just made it to this step. I think you have to apply the var you’ve just made to the other bb selectors