Today is also the chance of experiencing this problem, Heisei rarely used content on css, just find a lot of a method, concluded several very practical way
method 1:
<style>
body{
background:url(beijingtu.gif) top left;
background-size:100%;
}
</style>
Method Two:
<body>
<div id="Layer1" style="position:absolute; width:100%; height:100%; z-index:-1">
<img src="beijingtu.gif" height="100%" width="100%"/>
</div>
</body>
Method three:
First use a style tag
<style>
.background_img{
background:url("beijingtu.gif") no-repeat;
background-size: 100%; // this setting the picture covered the entire background
}
</style>
Then use the body in
<Body class = "background_img"> page content </ body>