html body {
	width: 100%;
	height: 100%;
}

.thumbnail {
	width:175px;
	height:175px;
	overflow:hidden;
	float:left;
	position:relative;
	border:1px solid grey;
}

img.thumby {
	position: absolute;
	left: 50%;
	top: 25%;
	-webkit-transform: translate(-50%,-25%);
	-ms-transform: translate(-50%,-25%);
	transform: translate(-50%,-25%);
}