Proč výška u layoutu není plovoucí?

body {
	margin:0;
	padding:0;
	background: black;
	text-align: center;
	color: white;
	font-size: 10pt;
	}

#hlavicka {
	padding: 0px;
	background: black;
	text-align: center;
}

#obsah {
	width: 950px;
	margin: 0 auto;
	border: 1px solid red;
	text-align: left;
	background: black;
	}

#levypanel {
	float: left;
	width: 200px;
	margin:0; padding:0;
	background: black;
	}

#levypanel-obsah {
	margin:0; 
	padding: 0.5em 1em;
	background: black;
	}

#hlavnipanel {
	margin:0 0 0 200px; 
	padding:0;
	background: black;
	}

#hlavnipanel-obsah {
	margin:0; 
	padding: 0.5em 1em;
	color: white;
	background: black;
	}

#paticka {
	padding: 10px;
	border-top: 1px solid red;
	background: black;
	color: red;
	text-align: center;
}

hr.cleaner {
	clear: both;
	display: none
	}