.blackout {
    background-color:#000;
    opacity:.7;
    filter:alpha(opacity=70);
    height:100%;
    width:100%;
    position:fixed;
    top:0;
    left:0;
    z-index:100;
    display:none;
    cursor:pointer;
}



http://hangaebal.blogspot.kr/2014/10/css-popup-window-with-dimmed-background.html

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