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Margin Problem


Streamfish

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http://portalbird.com/As you see, the first grey box is pushed 100 px down.But, i have set the top margin of that box to be zero:( "container" is the big gray one, and "header" is the smaller and darker one. )#container { width: 450px; height: 900px; background: rgb(200, 200, 200); margin: 0 auto; } #header { width: 300px; height: 80px; margin: auto; margin-top: 100px; background: rgb(100, 100, 100); }It is the darker box inside it that is ment to be pushed 100px down!why does this happen?EDIT:Problem solved, the content of the webpage wil now be removed.The old HTML and CSS is here:XHTML:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">	<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="no"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>Portalbird</title><link rel="stylesheet" href="styleSheet.css" type="text/css" media="all" /></head><body><div id="firstTestContainer">	<div id="container">		<div id="header"> </div>	</div></div>	<div id="secondTestContainer">	<div id="container">		<div id="secondHeader"> </div>	</div></div></body></html>

CSS:

#firstTestContainer {	height: 1000px;	width: 460px;	border: 1px black solid;	float:left;	}#secondTestContainer {	height: 1000px;	width: 460px;	border: 1px black solid;	float: right;	}			#container {	width: 450px;	height: 900px;	background: rgb(200, 200, 200);	margin: 0 auto;	}	#header {	width: 300px;	height: 80px;	margin: auto;	margin-top: 100px;	background: rgb(100, 100, 100);	}	#secondHeader {	width: 300px;	height: 80px;	margin: 0 auto;	background: rgb(100, 100, 100);	}

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Because top and bottom margins have a strange reverse-inheritance that I've never completely understood. You can solve it by adding "overflow: auto;" to the #container.By the way, you can't use the same id attribute on two different elements in the same page. Use class instead.

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