#stage {
  background-image: url("img/index-soft.jpg");
	background-repeat: no-repeat;
	background-size: contain;
	left: 0; top: 0; right: 0; bottom: 0;
}

#attackbtn  {position: absolute; width: 41%; height: 50%; left:  3%; top: 25%; background-image: url("img/btn-angriff.png");      background-repeat: no-repeat; background-size: contain;}
#defensebtn {position: absolute; width: 52%; height: 50%; left: 45%; top: 25%; background-image: url("img/btn-verteidigung.png"); background-repeat: no-repeat; background-size: contain;}