css - Positioning popup window in middle of the screen without JavaScript -

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i have following html , css, position popup window in middle of screen in browser window size. possible without javascript?

css:

.floating-window {     z-index: 9999;     position: absolute;     width: 200px; height: 200px;       cursor: default;     -moz-box-shadow: 1px 1px 1px #888;     -webkit-box-shadow: 1px 1px 1px #888;     box-shadow: 1px 1px 1px #888; }

html:

<div class='floating-window box'></div>

with percentages, can set box such half of on left side. 

width: 30%; left: 45%; /* 50% (center) - 15% (half of 30) */

you use px you'll limited absolute container width. have searched around? know there articles explaining method more extensively have.


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