.zoom-btn {
  background-position: center;
  background-repeat: no-repeat;
  z-index: 999999999;
  position: absolute;
  width: 22px;
  height: 22px;
  border: 1px solid black;
}

.zoom-btn-plus {
  background: white url('../images/plus.png') no-repeat center;
  top: 4px;
  left: 4px;
}

.zoom-btn-minus {
  background: white url('../images/minus.png') no-repeat center;
  top: 4px;
  left: 30px;
}

.zoomWindow { border: 1px solid black; }