*{margin:0; padding:0}

html, body{
	height: 100%;
	overflow: hidden;
	position:relative;
	}

#principal{
	width: 100%;
	height: 100%;
	float: left;
	z-index: 1;
	position: absolute;
}
	
#conteudo{
	width: 1920px;
	height: 1080px;
	left: 50%;
	top: 50%;
	margin-left: -960px;
	margin-top: -540px;
	position: absolute;
	background-image: url(../imagens/conteudo.jpg);
	background-repeat: no-repeat;
	z-index: 2;
}