console
<div class="bg" style="background: url('https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1594379183246&di=23ef8dd988c53d1fdb985ef5b8920461&imgtype=0&src=http%3A%2F%2Ft9.baidu.com%2Fit%2Fu%3D2268908537%2C2815455140%26fm%3D79%26app%3D86%26f%3DJPEG%3Fw%3D1280%26h%3D719') no-repeat center center/cover fixed" />
.bg{
width:100%;
height:100%;
position:fixed;
padding: 100%;
box-sizing:border-box;
z-index:1;
}
.bg:after{
content: "";
width:100%;
height:100%;
position:absolute;
left:0;
top:0;
background:inherit;
filter:blur(0.8rem);
z-index:2;
}