You should set the filter property to blur(2px). What is this? ı'm stuck please help me

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

  **Your code so far**
/* file: styles.css */
.canvas {
width: 500px;
height: 600px;
background-color: #4d0f00;
overflow: hidden;
box-shadow: 2px;
}

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

.one {
width: 425px;
height: 150px;
background-color: #efb762;
margin: 20px auto;
}

.two {
width: 475px;
height: 200px;
background-color: #8f0401;
margin: 0 auto 20px;
}

.three {
width: 91%;
height: 28%;
background-color: #b20403;
margin: 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 class="two"></div>
      <div class="three"></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/102.0.5005.63 Safari/537.36

Challenge: Step 34

Link to the challenge:

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.canvas {
width: 500px;
height: 600px;
background-color: #4d0f00;
overflow: hidden;

Step 34

The colors and shapes of your painting are too sharp to pass as a Rothko.

Use the filter property to blur the painting by 2px in the .canvas element.

I don’t understand this and I can’t. I tried every way.

The box models will blur.
filter:blur(2px);