<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>serafin</title>
<style>
body {
background-color: #292929;
margin: 0;
padding: 0;
}
img {
border: none;
display: block;
margin: auto;
max-width: 100%;
max-height: 100%;
}
</style>
</head>
<body>
<img src="s.png">
<script src="
https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script>
$(document).ready(function() {
$(window).on('resize', function() {
$('body').height($(window).height());
}).trigger('resize');
});
</script>
</body>
</html>