Learn CSS Variables by Building a City Skyline - Step 10

Tell us what’s happening:

Hi, can someone assist please. Its still telling me I havent selected the .bb1 class selector.

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>
    <div class="bb1">
  .bb1{width: 10%;
  height: 70%;}</style></div>

<!-- 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 Information:

Learn CSS Variables by Building a City Skyline - Step 10

  • The instruction: " Nest a div with a class of bb1 in the background buildings container." – Delete the complete ‘style’ element, and then nest the div with class bb1 in the background buildings container:
<div class="background-container">
   Here goes the nested div element with the "bb1" class
  • The instructions: “OPEN YOUR styles.css file, and give .bb1 a width of 10% and height of 70%. “bb” stands for “background building”, this will be your first building.”

Click on the button “styles.css” in your editor:
and there add the CSS rule for the .bb1 class, according to the instructions.

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