CSS - 背景

body:before {
    content: " ";
    position: fixed;
    z-index: -1;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: url(http://omuy6viz3.bkt.clouddn.com/2017/05/390210278.png) center 0 no-repeat;
    background-size: cover;
    opacity: .3;
}
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