Learn the CSS Box Model by Building a Rothko Painting - Step 20

Tell us what’s happening:
I don’t understand why there is no space created between the .one element and .canvas element at the top margin after completing this step - >
margin: 20px auto;

Your code so far

/* file: styles.css */
.canvas {
  width: 500px;
  height: 600px;
  background-color: #4d0f00;
}

.frame {
  border: 50px solid black;
  width: 500px;
  padding: 50px;
  margin: 20px auto;
}

.one {
  width: 425px;
  height: 150px;
  background-color: #efb762;
margin: 20px auto;
}
<!-- file: index.html -->
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>Rothko Painting</title>
    <link href="./styles.css" rel="stylesheet">
  </head>
  <body>
    <div class="frame">
      <div class="canvas">
        <div class="one"></div>
      </div>
    </div>
  </body>
</html>

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/106.0.0.0 Safari/537.36

Challenge: Learn the CSS Box Model by Building a Rothko Painting - Step 20

Link to the challenge: