body{
    background-color: black;
    color:grey;
    width:1000px;
    margin : 0 auto;
}
section{
	width:900px;
	margin : 0 auto;
}
.present_gallery{
	width:300px;
	max-width: 300px;
	height:200px;
	max-height: 200px;
	border:1px solid grey;
	display: block;
}