<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Scroll Effect</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        .section {
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            color: white;
            text-align: center;
            transition: background-color 0.5s;
        }
        .section:nth-of-type(odd) {
            background-color: #007bff;
        }
        .section:nth-of-type(even) {
            background-color: #28a745;
        }
    </style>
</head>
<body>
    <div class="section">
        <h1>Section 1</h1>
    </div>
    <div class="section">
        <h1>Section 2</h1>
    </div>
    <div class="section">
        <h1>Section 3</h1>
    </div>
    <div class="section">
        <h1>Section 4</h1>
    </div>
</body>
</html>  <h1>Section 2</h1>
    </div>
    <div class="section">
        <h1>Section 3</h1>
    </div>
    <div class="section">
        <h1>Section 4</h1>
    </div>
</body>
</html>  <h1>Section 2</h1>
    </div>
    <div class="section">
        <h1>Section 3</h1>
    </div>
    <div class="section">
        <h1>Section 4</h1>
    </div>
</body>
</html>  <h1>Section 2</h1>
    </div>
    <div class="section">
        <h1>Section 3</h1>
    </div>
    <div class="section">
        <h1>Section 4</h1>
    </div>
</body>
</html>  <h1>Section 2</h1>
    </div>
    <div class="section">
        <h1>Section 3</h1>
    </div>
    <div class="section">
        <h1>Section 4</h1>
    </div>
</body>
</html>  <h1>Section 2</h1>
    </div>
    <div class="section">
        <h1>Section 3</h1>
    </div>
    <div class="section">
        <h1>Section 4</h1>
    </div>
</body>
</html>  <h1>Section 2</h1>
    </div>
    <div class="section">
        <h1>Section 3</h1>
    </div>
    <div class="section">
        <h1>Section 4</h1>
    </div>
</body>
</html>  <h1>Section 2</h1>
    </div>
    <div class="section">
        <h1>Section 3</h1>
    </div>
    <div class="section">
        <h1>Section 4</h1>
    </div>
</body>
</html>  <h1>Section 2</h1>
    </div>
    <div class="section">
        <h1>Section 3</h1>
    </div>
    <div class="section">
        <h1>Section 4</h1>
    </div>
</body>
</html>