<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
p::selection{color: pink;}
#div1{
width: 300px;
height: 300px;
border: 1px solid blue;
background: radial-gradient(circle at top left,yellow 0%,orange 50%,red 100%);
}
#div2{background: url(img/1.jpg) no-repeat top center;}
</style>
</head>
<body>
<p>快乐渐变两个</p>
<div></div>
<div></div>
</body>
</html>
改变背景图颜色