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Result Size: 625 x 565
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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
body {
  padding: 25px;
  background-color: white;
  color: black;
  font-size: 25px;
}
.dark-mode {
  background-color: black;
  color: white;
}
</style>
</head>
<body>
<h2>Toggle Dark/Light Mode</h2>
<p>Click the button to toggle between dark and light mode for this page.</p>
<button onclick="myFunction()">Toggle dark mode</button>
<script>
function myFunction() {
   var element = document.body;
   element.classList.toggle("dark-mode");
}
</script>
</body>
</html>
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