body {
	background-color: #dddddd;
}
#stage {
	width: 1000px;
	height: 500px;
	position: relative;
	margin: auto;
	background-color: #222;
}
#player {
	width: 50px;
	height: 50px;
	position: absolute;
	z-index: 999;
	top: 345px;
	left: 0;
	display: none;
}
#wall {
	position: absolute;
}
#exit {
	width: 10px;
	height: 180px;
	background-color: red;
	position: absolute;
	top: 30px;
	right: 0;
	opacity: 0;/* opacity set to 0 to 'hide' the exit*/
}