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<!DOCTYPE html>
<html>
<head>
    <title>Page Title</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f4;
            margin: 0;
            padding: 0;
        }
        h1 {
            color: #333333;
        }
        p {
            color: #666666;
        }
        .container {
            max-width: 800px;
            margin: 0 auto;
            padding: 20px;
            background-color: #ffffff;
            border-radius: 5px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
        }
        .button {
            background-color: #4CAF50;
            border: none;
            color: white;
            padding: 10px 20px;
            text-align: center;
            text-decoration: none;
            display: inline-block;
            font-size: 16px;
            margin: 4px 2px;
            cursor: pointer;
            border-radius: 5px;
        }
    </style>
</head>

<body>
    <div class="container">
        <h1>My First Heading</h1>
        <p>My first paragraph.</p>
        <button class="button" onclick="changeBackgroundColor()">Change Background Color</button>
    </div>
    <script>
        function changeBackgroundColor() {
            var colors = ['#FF5733', '#33FF57', '#3373FF', '#FF33FF', '#FFFF33'];
            var randomColor = colors[Math.floor(Math.random() * colors.length)];
            document.body.style.backgroundColor = randomColor;
        }
    </script>
</body>
</html>
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