html{
background-image:url(https://cn.bing.com/HPImageArchive.aspx?idx=0&n=1);
background-position:0 0;
background-attachment:fixed;
background-size:100%;
}
.block-vip1:before{
background-position:-928px -3616px;
}
.block-vip2:before{
background-position:-896px -3616px;
}
.block-vip3:before{
background-position:-832px -3616px;
}
.block-vip4:before{
background-position:-864px -3616px;
}