#stage {
	width: 1500px;
	height: 600px;
	background-image: url('gallery.jpg');
	background-size: 1500px 600px;
	background-repeat: no-repeat;
	position: relative;
}
.invisiBox {
	position: absolute;
	width: 200px;
	height: 200px;
	background-color: red;
	opacity: 0;
	cursor: pointer;
}