css3径向渐变怎么写呢 详细
background: radial-gradient(#ace, #f96, #1E90FF);
更多可点击查看： http://www.cnblogs.com/lhb25/archive/2013/02/24/css3-radial-gradient.html
radial-gradient();
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Gradient</title>
<style type="text/css">
p {
width: 400px;
height: 150px;
line-height: 150px;
text-align:center;
color: #000;
font-size:24px;
background-image:radial-gradient(circle closest-side, red, orange,yellow,green,blue,indigo,violet);
}
</style>
</head>
<body>
<p>右下角向左上角的线性渐变背景</p>
</body>
</html>