body{
  background-color:#000000;
}

#horizon{
	text-align: center;
	position: absolute;
	top: 0px;
/*  top: 50%;*/
	left: 0px;
	width: 100%;
	height: 1px;
	overflow: visible;
	display: block
}
	
#content{
  width: 100%;
	height: 770px;
/*  margin-left: -502px;*/
/*  position: absolute;*/
/*  top: 0px;*/
/*  top: -340px;*/
/*  left: 50%;*/
/*  visibility: visible;*/
}

#game-horizon, #exit-button-horizon{
  position: absolute;
  top: 50%;
  left: 0px;
  width: 100%;
  height: 1px;
  overflow: visible;
}


#game, #exit-button-container{
  width: 640px;
  height: 480px;
  margin-left: -320px;  /***  width / 2   ***/
  position: absolute;
  top: -240px;          /***  height / 2   ***/
  left: 50%;
}

#exit-button{
  width: 43px;
  height: 46px;
  margin-left: 650px;
  position: absolute;
  top: 0px;
/*  left: 50%;*/
}