Larghezza div annidati

[Asmodeo]

già, sbaglio? cmq ecco il codice....

HTML

  
    <div id="centrale">
        <div id="header"></div>
	<div id="menu"></div>
	<div id="contenuti"></div>	
	<div id="extranav"></div>
    </div>

CSS

  
div#header{
	background-color: #005F90;
	width: 60%;
	height: 20%;
	position: absolute;
	top: 0%;
}
div#menu{
	background-color: #2D94FD;
	position: absolute;
	top: 20%;
	width: 15%;
}
div#contenuti{
	background-color: #02B6EA;
	position: absolute;
	top: 20%;
	margin-left: 15%;
	margin-right: 15%;
	width: 30%;
}
div#extranav{
	background-color: #2D94FD;
	position: absolute;
	top: 20%;
	margin-left: 45%;
	width: 15%;
}
div#centrale{
	background-color: #02B6EA;
	width: 60%;
	height: 83%;
	margin: auto;
	text-align: left
}