#garten {
  position: absolute;
  left: 150px;
  top: 80px;
  width: 800px;
  height: 150px;
  float: left;
}
#gaststube {

  position: absolute;
  top: 230px;
  left: 150px;
  width: 800px;
  height: 150px;
    float: right;

}
#saal{
  position: absolute;
  left: 150px;
  bottom: 20px;
  width: 800px;
  height: 150px;
    float: left;
  }