javascript - Multiple popup window layers position in CSS -

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hi have jquery popup window has 3 layers image below. i'm trying make window3 centered overlaps window2. reason, window3 stays @ top-left corner image. tried many different ways(padding, margin, z-index, position..) no matter do, window3 won't centered. maybe missed , hope other ideas. didn't post html since contains 3 windows div tags bunch data-fields generated javascript below.

enter image description here

function( contenturl, container, theight, twidth, controller, param ){                            if( container === "dialog" ){                 var mask = '<div class="mask"></div>';                 var window3 = '<div class="window3"></div>';                  $(mask).appendto('body');                 $(window3).appendto('body');

style.css

 .mask {         position: fixed;         left: 0;         top: 0;         width: 100%;         height: 100%;         background: #000000;         opacity: 0.7;         z-index: 10;     }             .window1 {         background: #006666;         width:430px;         height:330px;         opacity: 0.5;                 padding:10px;     }   .window2 {         background: #fff;                       width:400px;         height:300px;         border-radius:14px;         margin:10px;      }  .window3{            position: fixed;         background: #ffffff;         margin: auto;         top: 0;         left: 0;         right: 0;         bottom: 0;         border-radius:14px;         z-index: 10;     }

try:

position: relative; on window 3


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