Q on Add Different Padding to Each Side of an Element

1

Tell us what’s happening:

I have a red x on “Your green-box class should give the top of the elements 40px of padding.” The thing is, I think I have it right. Under background-color:green; I have padding-top: 40x;
What is wrong?

Your code so far

<style>
  .injected-text {
    margin-bottom: -25px;
    text-align: center;
  }

  .box {
    border-style: solid;
    border-color: black;
    border-width: 5px;
    text-align: center;
  }

  .yellow-box {
    background-color: yellow;
    padding: 10px;
  }
  
  .red-box {
    background-color: red;
    padding-top: 40px;
    padding-right: 20px;
    padding-bottom: 20px;
    padding-left: 40px;
  }

  .green-box {
    background-color: green;
    padding-top: 40x;
    padding-right: 20px;
    padding-bottom: 20px;
    padding-left: 40px;
  }
</style>
<h5 class="injected-text">margin</h5>

<div class="box yellow-box">
  <h5 class="box red-box">padding</h5>
  <h5 class="box green-box">padding</h5>
</div>

Your browser information:

Your Browser User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.119 Safari/537.36.

Link to the challenge:
https://www.freecodecamp.org/challenges/add-different-padding-to-each-side-of-an-element