<!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>
// Enter code directly in the console for instant dark mode.
var allDivs = document.querySelectorAll('div');
for(var i = 0; i < allDivs.length; i++){
allDivs[i].style['background-color'] = 'black';
allDivs[i].style['color'] = 'green';
allDivs[i].style['font-family'] = 'Monospace';
}