nothing.html

<!DOCTYPE html>
<html lang="en-US">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Under Construction</title>
<style>
body {
	height: 100%;
	width: 100%;
}
.light {
	background-color: #f8f9fa;
	color: #212529;
}
.dark {
	background-color: #333333;
	color: #337ab7;
}
.container {
   align-items: center;
   display: flex;
   justify-content: center;
   min-height: 24em;
}
.inner-container {
   flex: 1;
   font: normal 32px helvetica,sans-serif;
   text-align: center;
}
</style>
</head>
<body>
<div class="container">
<div class="inner-container">Under Construction</div>
</div>
<script>
if (window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches) {
document.body.classList.add('dark');
} else {
document.body.classList.add('light');
}
</script>   
</body>
</html>