body{padding:0;margin:0;}
body,html{height:100%;}
#outer{height:100%;overflow:hidden;position:relative;width:100%;background:ivory;}
#outer[id]{display:table;position:static;}
#middle{position:absolute;top:50%;}/*forexploreronly*/
#middle[id]{display:table-cell;vertical-align:middle;position:static;}
#inner{position:relative;top:-50%;width:400px;margin:0auto;}/*forexploreronly*/
div.greenBorder{border:1pxsolidgreen;background-color:ivory;}
<divid="outer">
<divid="middle">
<divid="inner"class="greenBorder">
</div>
</div>
</div>
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