<!DOCTYPE HTML>
<head>
<style type="text/css">
body
{
background: #ff0000 url(img/QQ图片20150821075230.ico) no-repeat fixed center ;
//no-repeat fixed center 无反复固定中心
}
p.bottommargin
{
margin-bottom: 205px;
color: black;
border: solid thick green;
}
</style>
</head>
<body >
<p>This is a paragraph with no margin specified</p>
<p class="bottommargin">This is a paragraph with a specified bottom margin</p>
<p>This is a paragraph with no margin specified</p>
</body>
</html>
