径向渐变
盒子的background-imge属性可以用==radial-gradient()== 形式创建径向渐变背景
background-image:radial-gradient(50% 50% ==圆心坐标==,red,blue);
一般不常用，所以简单介绍，简单练习。。。。
案例演示
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.box1 {
width:200px;
height:200px;
border: 1px solid #000;
/* background-image:radial-gradient(50% 50%,red ,blue ,green); */
background-image:radial-gradient(50% 50%,white,pink);
}
</style>
</head>
<body>
<div class="box1"></div>
</body>
</html>
