freeCodeCamp/curriculum/challenges/english/01-responsive-web-design/applied-visual-design/change-the-position-of-overlapping-elements-with-the-z-index-property.english.md

id, title, challengeType, videoUrl, forumTopicId

id	title	challengeType	videoUrl	forumTopicId
587d78a3367417b2b2512acf	Change the Position of Overlapping Elements with the z-index Property	0	https://scrimba.com/c/cM94aHk	301046

Description

When elements are positioned to overlap (i.e. using position: absolute | relative | fixed | sticky), the element coming later in the HTML markup will, by default, appear on the top of the other elements. However, the z-index property can specify the order of how elements are stacked on top of one another. It must be an integer (i.e. a whole number and not a decimal), and higher values for the z-index property of an element move it higher in the stack than those with lower values.

Instructions

Add a z-index property to the element with the class name of first (the red rectangle) and set it to a value of 2 so it covers the other element (blue rectangle).

Tests

tests:
  - text: The element with class <code>first</code> should have a <code>z-index</code> value of 2.
    testString: assert($('.first').css('z-index') == '2');

Challenge Seed

<style>
  div {
    width: 60%;
    height: 200px;
    margin-top: 20px;
  }

  .first {
    background-color: red;
    position: absolute;

  }
  .second {
    background-color: blue;
    position: absolute;
    left: 40px;
    top: 50px;
    z-index: 1;
  }
</style>

<div class="first"></div>
<div class="second"></div>

Solution

<style>
  div {
    width: 60%;
    height: 200px;
    margin-top: 20px;
  }

  .first {
    background-color: red;
    position: absolute;
    z-index: 2;
  }
  .second {
    background-color: blue;
    position: absolute;
    left: 40px;
    top: 50px;
    z-index: 1;
  }
</style>
<div class="first"></div>
<div class="second"></div>