.scrolling-content {
	width:1950px;
 	position: absolute;
}

#content_concept
{ 
 	left:0;top:0;
}

#content_uitvoering
{ 
 	left:650px;top:0;
}
#content_rapport
{ 
 	left:1300px;top:0;
}
.box-content {
	/*position:absolute;*/
	width:620px; 
}