I dont understand these instructions someone help

HTML-CSS
1

Tell us what’s happening:
I don’t understand these step 11 instructions

Your code so far

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

<!-- file: index.html -->
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>Rothko Painting</title>
    <link href="./styles.css" rel="stylesheet">
  </head>

<!-- User Editable Region -->

  <body>

    <div>
    </div>
<div class="canvas" class="frame">
  </div>


<!-- User Editable Region -->

  </body>

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36 Edg/110.0.1587.41

Challenge: Learn the CSS Box Model by Building a Rothko Painting - Step 11

Link to the challenge:

2

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