Cannot proceed to the next challenge what is the problem

HTML-CSS
1

Tell us what’s happening:

  **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: 20px 40px 20px 40px;
}

.red-box {
  background-color: red;
  margin: 20px 40px 20px 40px;
  padding: 1.5cm;

}

.green-box {
  background-color: green;
  margin: 20px 40px 20px 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:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.141 Safari/537.36 OPR/73.0.3856.438.

Challenge: Understand Absolute versus Relative Units

Link to the challenge:

2

cm is not a valid unit in CSS

3

Thanks alot for rectifying my mistake

4

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