<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Background Color Changer</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      text-align: center;
    }
    button {
      padding: 10px 20px;
      font-size: 16px;
      cursor: pointer;
    }
  </style>
</head>
<body>

<h1>Background Color Changer</h1>
<button id="changeColorBtn">Change Color</button>

<script>
  // Selecting the button element
  const changeColorBtn = document.getElementById('changeColorBtn');

  // Adding an event listener to the button
  changeColorBtn.addEventListener('click', function() {
    // Generating a random color
    const randomColor = '#' + Math.floor(Math.random()*16777215).toString(16);

    // Changing the background color of the body
    document.body.style.backgroundColor = randomColor;

    // Logging the color change
    console.log('Background color changed to: ' + randomColor);
  });
</script>

</body>
</html>