body { background:#999; }

#page-wrap { width: 900px; position:relative }
#page-wrap:after { content: "Pantalla Grande"; }
#main-content { 
	float: left;
	width: 440px;
	height: 300px; 
	margin-left: 218px; }

#secondary-one {
	width: 170px;
	height: 300px;
	position: absolute;
	left: 1px;
	top: 85px;
}

#secondary-two { float: right; width: 153px; height: 300px; }

#detalle { width: 440px; height: 250px; position:relative}