Add Different Margins to Each Side of an Element glitch?

Tell us what’s happening:
Hi

i was doing the lesson and did everything correctly, but when i tried submit it, it wouldnt accept my answer, i ended up taking off the ( x ) of the margins so instead of margin-left:20x it was margin-left:20 and it accepted my answer

is this a glitch or is this a thing?

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;
    margin-top: 40px;
    margin-right: 20px;
    margin-bottom: 20px;
    margin-left: 40px;
  }

  .green-box {
    background-color: green;
    padding-top:40x;
    padding-left:40x;
    padding-right:20px;
    padding-bottom:20x;
    margin-top:40;
    margin-left:40;
    margin-right:20;
    margin-bottom:20; 
  }
</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/61.0.3163.100 Safari/537.36.

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

ahhhh omg haha wow i didnt even notice the px… thanks