.dropDownBox {
  width: 80px;
  position: fixed;
  top: 0;
  left: 0;
  background-color: #fff;
  box-shadow: 0 0 5px rgba(0, 0, 0, 0.2);
  z-index: 999;
  text-align: center;
  line-height: 40px;
  cursor: pointer;
}

.dropDownBox > div:hover {
  background-color: rgb(235, 95, 60);
  color:#fff;
}

.hide {
  display: none;
}

.serveIntroduce {
  position: fixed;
  top: 50%;
  right: 10px;
  width: 50px;
  height: 50px;
  font-size: 11px;
  cursor: pointer;
}

.serveIntroduce > img {
  width: 50px;
}