html, body {
    background: black;
    height: 100%;
    overflow: hidden;
}
#spacer{
	width:1px;
	height:50%;
	float:left;
	margin-bottom:-150px; /* half of container's height */
}

#container{
	position: relative;
	clear: left;
	background-color: #000;
	width: 700px;
	height: 300px;
	margin: auto;
}



.item{
	float: left;
	margin: 10px;
	background-color: whitesmoke;
	width: 200px;
	height: 200px;
}

.item a img{
	border:5px solid #EEE;
	color:#333;
	font-weight:bold;
}

.item a:hover img{
	border-color:#FF0000;
}