javascript - How to dynicamlly center the center of a div based on screen size -

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i thought simple i'm losing mind! simple want center div in div of screen. not top left of div center of screen center of div in center.

here div css

.box {     padding-top:20px;     padding-left:5px;     background-color: #ffffff;     background-color: rgba(221,221,221,0.5);     border: 1px solid black;     border-radius: 25px;     filter: alpha(opacity=90);     height: 125px;     width: 250px;     z-index: 1; }  <form id="form1" runat="server"> <div id="box"><div> </form>

thanks! couldnt figure out how html side in code block. center horizontally , vertically.

use position:absolute if need centred both horizontally , vertically:

#box {     position:absolute;      top:0; left:0; right:0; bottom:0;      margin:auto;     /* etc */ }

http://jsfiddle.net/wcfmw/


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