Result checking is not working in this challenge please help me

HTML-CSS
1

Tell us what’s happening:

This code is written by me and i checked every single type of problem. But, this is not working. The challenge is to create bottom margine of 20px in class blue-box CSS. I created it correctly but the result is saying that i am not putting margin to 20px of bottom.

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: crimson;
  color: #fff;
  margin-top: 40px;
  margin-right: 20px;
  margin-left: 40px;
  margin-bottom: 20px;
}

.blue-box {
  background-color: blue;
  margin-top:40px;
  margin-right:20px;
  margin-left: 40px;
  margin_bottom:20px;
  color: #fff;
}
</style>
<h5 class="injected-text">margin</h5>

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

Your browser information:

User Agent is: Mozilla/5.0 (Linux; Android 8.1.0; vivo 1801) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Mobile Safari/537.36.

Challenge: Add Different Margins to Each Side of an Element

Link to the challenge:
https://www.freecodecamp.org/learn/responsive-web-design/basic-css/add-different-margins-to-each-side-of-an-element

2

@nischalyadav0 you have margin_bottom instead of margin-bottom

3

Very very much thank you brother.