#box1, #box2, #box3, #box4{
	position:absolute;
	
}

#box1 img{
  width:389px;
}

.mask{
	height:230px;
	left:225px;

	overflow:hidden;
	position:relative;
	top:16px;
	width:390px;
}
.mask img{
	position:absolute;
	display:block;
	border:none;
}