html背景图片自适应

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">    
<html>    
<head>    
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">    
<title>hello world</title>    
</head>    
<body>    
<div id="Layer1" style="position:absolute; 100%; height:100%; z-index:-1">    
<img src="pictures/background.jpg" height="100%" width="100%"/>    
</div>    
</body>    
</html>
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原文地址：https://www.cnblogs.com/BrightMoon/p/3957864.html