2.
@牧尘，
body{
text-align:center;
//padding:3px;
//color:red;
font-size:14px;
width:auto;
margin:auto;
//border:0px double #99ccff;
border-radius:5px;
font-family:'Titillium';
<background="bg.jpg">;
}
改成
body{
text-align:center;
//padding:3px;
//color:red;
font-size:14px;
width:auto;
margin:auto;
//border:0px double #99ccff;
border-radius:5px;
font-family:'Titillium';
background:url(bg.jpg);
}