<!doctype html>
<html>
<head>
<meta charset=utf-8 />
<style type="text/css">
body {
text-align: center;
font-family: 'Menlo', 'Monaco', Courier, monospace;
background-color: whitesmoke;
padding-top: 10%;
}
.number {
font-size: 800%;
font-weight: bold;
margin-bottom: 40px;
}
.message {
font-size: 400%;
}
</style>
</head>
<body>
<div class="number">504</div>
<div class="message">Gateway Timeout</div>
</body>
</html>