File: //var/www/html/503.html
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<title>503 Error</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="robots" content="noindex, nofollow">
<style>
@media screen and (max-width:500px) {
body { font-size: .6em; }
}
</style>
</head>
<body style="text-align: center;">
<h1 style="font-family: Georgia, serif; color: #4a4a4a; margin-top: 4em; line-height: 1.5;">
Sorry, that didn’t work. <br>Please try again or come back later.
</h1>
<h2 style=" font-family: Verdana, sans-serif; color: #7d7d7d; font-weight: 300;">
503 Error. Service Unavailable.
</h2>
</body>
</html>