body {
	margin-left: 0%;
	margin-top: 0%;
	margin-right: 0%;
	margin-bottom: 0%;
	background: url(imagens/portalbg.gif);
}

.dim {
max-width:1600px;
min-width: 800px;
}
#center {
width: 800px;
height: 600px;
top: 50%;
left: 50%;
margin-top: -300px;
margin-left: -400px;
position: absolute;
}