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How do I load something to cover the entire browser height?


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I'm using a lightbox which currently only blacks out the visible portion of the screen. The problem is if you scroll down while the lightbox is showing, the portion you're scrolling down to isn't under the lightbox. How do I have the lightbox cover the entire page top to bottom?

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
	<title>LIGHTBOX EXAMPLE</title>
	<style>
	.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=80);
	}
	.white_content {
		display: none;
		position: absolute;
		top: 25%;
		left: 25%;
		width: 50%;
		height: 50%;
		padding: 16px;
		border: 16px solid orange;
		background-color: white;
		z-index:1002;
		overflow: auto;
	}
</style>
</head>
<body>
	<p>This is the main content. To display a lightbox click <a href = "javascript:void(0)" onclick = "document.getElementById('light').style.display='block';document.getElementById('fade').style.display='block'">here</a></p>
	<div id="light" class="white_content">This is the lightbox content. <a href = "javascript:void(0)" onclick = "document.getElementById('light').style.display='none';document.getElementById('fade').style.display='none'">Close</a></div>
	<div id="fade" class="black_overlay"></div>
<div style = "height: 2000px;">Very large div</div>
</body>
</html>

 

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