<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Snow Demo</title>
<style>
body {
padding:0; margin:0;
background: #3B3B3B;
}
#demo {
display: block;
margin: 25px auto;
border: 1px solid #000;
}
</style>