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

Tags: javascript,css

Problem :

I really thought this would be simple but i'm losing my mind! I just simple want to center a div in the div of the screen. But not that top left of the div to the center of the screen but the center of the div in the center.

Here is my div css

    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>

Thanks! I couldnt figure out how to get the html to side in a code block. This is center horizontally and vertically.

Solution :

Use position:absolute if you need it centred both horizontally and vertically:

#box {
    top:0; left:0; right:0; bottom:0; 
    /* etc */

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