Css div element

Tell us what’s happening:
Describe your issue in detail here.

i don’t seem to understand this

  **Your code so far**
/* file: index.html */
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Colored Markers</title>
  <link rel="stylesheet" type="text/css" href="styles.css">
</head>
<body>
  <h1>CSS Color Markers</h1>
  <div class="container">
    <div class="markerclass1">
    </div>
    <div class="marker">
    </div>
    <div class="marker">
    </div>
  </div>
</body>
</html>
/* file: styles.css */
h1 {
text-align: center;
}

.marker {
width: 200px;
height: 25px;
background-color: red;
margin: 10px auto;
}

  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36

Challenge: Step 16

Link to the challenge:

The instructions are:

First, add the class one to the first marker div element.

We know how to add a class to an element that has not classes, right? If we have a p:

<p>

and we want to add the class “alpha” to it, we get:

<p class="alpha">

What if we want to add another class? Things can have more than one class. You just list them out, separated by a space.

<p class="alpha beta">

This is basically what you are being asked to do.