背景模糊
filter: blur(9px)
实现背景模糊的思路：通过给父元素的after伪元素设置模糊，来模拟父元素的背景模糊，然后我们通过定位元素层级来突出显示内容部分，这样就防止后代继承模糊了
代码如下：
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<link rel="stylesheet" href="">
<style>
* {
margin: 0;
padding: 0;
}
.bg {
width: 100%;
height: 100%;
position: relative;
background: url("images/bg.jpg") no-repeat fixed;
padding: 1px;
box-sizing: border-box;
z-index: 1;
}
.bg:after {
content: "";
width: 100%;
height: 700px;
position: absolute;
left: 0;
top: 0;
background: inherit;
filter: blur(10px);
z-index: 2;
}
.drag {
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
width: 200px;
height: 200px;
text-align: center;
color: red;
z-index: 11;
}
</style>
</head>
<body>
<div class="bg">
<div class="drag">hello world</div>
</div>
</body>
</html>
效果如下：
image.png
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