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How to center a box bang on in the middle of the screen


Orionsbelter

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
<style type="text/css">
.black_overlay{
            display: none;
            position: absolute;
            top: 0%;
            left: 0%;
            width: 100%;
            height: 100%;
            background-color: black;
            z-index:1001;
            -moz-opacity: 0.8;
            opacity:.80;
            filter: alpha(opacity=60);
        }
        .white_content {
            display: none;
            position: absolute;
            z-index:1002;
            overflow: auto;
		color: #FFF;
		font: Verdana, Geneva, sans-serif;
		font-size: 14px;
        }
</style>
</head>

<body>
<script type="text/javascript">
window.onload = function() {
document.getElementById('light').style.display='block';
document.getElementById('fade').style.display='block';
};
</script>
<div id="light" class="white_content"><div align="right"><a href = "javascript:void(0)" onclick = "document.getElementById('light').style.display='none';document.getElementById('fade').style.display='none'"><img src="images/Login/cross.png" alt="Close" title="Close" height="20" width="20"/></a></div><div align="center">
<div style="background-image: url(../images/BGs/lightBoxTop.gif); width:604px; height:20px;">
  </div>
  <div style="background-image: url(../images/BGs/lightBoxMain.gif); width:604px;">
Hello
  </div>
  <div style="background-image: url(../images/BGs/lightBoxBot.gif); width:604px; height:20px;">
  </div>
</div></div>
        <div id="fade" class="black_overlay"></div> 
</body>
</html>

 

I NEED THE LIGHTBOX TO CENTER IN THE MIDDLE OF THE SCREEN.

 

Can anyone help me please, thank you for reading :D

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You can only vertically center an object using CSS if it has a fixed height:

 

HTML:

<div id="black_overlay">
  <div id="white_content">Some data</div>
</div>

CSS:

#black_overlay
{
  position:fixed;
  height:100%;
  width:100%;
  background-color:black;
}
#white_content
{
  height:200px;
  width:200px;
  position:relative;
  top:50%;
  margin:-100px auto 0;
  background-color:white;
}

 

Something like that. Going off the top of my head, so you may have to play with it a bit.

 

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