Ejercicio 1

💻 Código HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="css/background.css">
    <title>Document</title>
</head>
<body>
    
<h2>scroll (<code>default</code>)</h2>
<div class="scroll"><div class="expand"></div></div>

<h2>scroll (<code>fixed</code>)</h2>
<div class="fixed"><div class="expand"></div></div>

<h2>scroll (<code>local</code>)</h2>
<div class="local"><div class="expand"></div></div>

<br class="extra-space">

</body>
</html>

🎨 Código CSS

h2 {
    text-align: center;
    margin-top: 48px;
  }
  
div {
    height: 200px;
    width: 50%;
    max-width: 600px;
    margin: 32px auto;
    overflow-x: hidden;
    overflow-y: scroll;
  }
  
.scroll {
    background: url('https://picsum.photos/700?id=1');
    background-attachment: scroll;
  }
  
.fixed {
    background: url('https://picsum.photos/700?id=2');
    background-attachment: fixed;
  }
  
.local {
    background: url('https://picsum.photos/700?id=3');
    background-attachment: local;
  }
  
.expand {
    height: 400px;
    width: 100%;
  }
  
.extra-space {
    margin-bottom: 50px;
  }

📸 Resultado del ejercicio

Resultado
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