Background: Christmas arrived again, take what to coax girlfriend happy?

Project Structure:

html:

<! DOCTYPEhtml PUBLIC "- / / / / W3C DTD XHTML 1.0 Transitional / / EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>CSS3 Christmas tree snowman snow animation effect</title>

<style type="text/css">	
body{margin:0;padding:0;list-style-type:none; }.header{
	margin: 0 0 30px;
	background: url(css/img/header-bg.png);
	background: url(css/img/snow-bg.png) repeat-y center, url(
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