* {
	margin:0;
	padding:0;
	border:0;
	list-style:none;
}

body{
	background:url(../imagens/fundo_index.jpg) no-repeat top center;
}

#principal{
	margin:0;
	margin-left:-375px;
	margin-top:-250px;
	width:750px;
	height:500px;
	position: absolute;
	left: 50%;
	top: 50%;
}