Learn CSS Variables by Building a City Skyline - Step 10

Tell us what’s happening:
Describe your issue in detail here; How do I use a .bb1 class selector to style an element.

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" />


<!-- User Editable Region -->

    <div class="background-buildings">
      <div class="bb1"></div>
      .bb1{ width: 10%;

<!-- User Editable Region -->

/* file: styles.css */
* {
  border: 1px solid black;
  box-sizing: border-box;

body {
  height: 100vh;
  margin: 0;
  overflow: hidden;

.background-buildings {
  width: 100%;
  height: 100%;

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 10

Link to the challenge:

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Restart step.

You did well this part of the task. Repeat it:

The second part of the task is to add class selector and its properties and values in the styles.css file which you can open by clicking on the following button:

In your styles.css file enter a new class selector, which is .bb1, and add the required properties - width and height, with their values:

.class {
  property: value;
  property: value;
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Thank you so much… it worked.

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