#ebene3 {
          position:absolute; left: 200px; top: 110px; width: 400; height: 200; z-index: 1; visibility: visible;}


#ebene4 {
          position:absolute; left: 50px; top: -100px; width: 30; height: 30; z-index: 0; visibility: hidden;}

#ebene100 {
          position:absolute; left: 125px; top: 90px; width: 30; height: 30; z-index: 3; visibility: visible;}