通过设置filter:blur来设置，代码如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<style type="text/css">
.content {
color: #ffffff;
font-size: 40px;
}
.bg {
background: url('//repo.bfw.wiki/bfwrepo/image/60c07cff9f8ec.png');
height: 600px;
text-align: center;
line-height: 600px;
}
.bg-blur {
float: left;
width: 100%;
background-repeat: no-repeat;
background-position: center;
background-size: cover;
-webkit-filter: blur(15px);
-moz-filter: blur(15px);
-o-filter: blur(15px);
-ms-filter: blur(15px);
filter: blur(15px);
}
.content-front {
position: absolute;
left: 10px;
right: 10px;
height: 600px;
line-height: 600px;
text-align: center;
}
</style>
</head>
<body>
<div>
<div class="bg bg-blur"></div>
<div class="content content-front">
我是内容
</div>
</div>
</body>
</html>
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