.banner {
  position: relative;
  /*相对定位 给绝对定位位置参考*/
  width: 100%;
  height: 450px;
  /*float: left;*/
}

.banner .item {
  display: none;
  /*隐藏元素*/
  position: absolute;
  /* 绝对定位*/
  width: 100%;
  height: 450px;
  top: 0;
  left: 0;
}

ul {
  list-style-type: none;
  /*清除默认列表样式 ....*/
  margin: 0;
  padding: 0;
  /*内外编剧清除*/
}

.lunbo {
  width: 100%;
  height: 450px;
}

/*左右按钮的属性设置*/

.lr-tab .btn {}

.lr-tab .left {
  position: absolute;
  left: 10px;
  top: 50%;
  margin-top: -18px;
  width: 36px;
  height: 36px;
  line-height: 36px;
  text-align: center;
  font-size: 25px;
  border: 0;
  border-radius: 50%;
  background-color: rgba(0, 0, 0, .2);
  color: #fff;
  cursor: pointer;
}

.lr-tab .right {
  position: absolute;
  left: 10px;
  top: 50%;
  margin-top: -18px;
  width: 36px;
  height: 36px;
  line-height: 36px;
  text-align: center;
  font-size: 25px;
  border: 0;
  border-radius: 50%;
  background-color: rgba(0, 0, 0, .2);
  color: #fff;
  cursor: pointer;
  left: auto!important;
}

.lr-tab .left {
  left: 20px;
  background-position-x: -83px;
}

.lr-tab .right {
  right: 20px;
  background-position-x: -125px;
}

.lr-tab .left:hover {
  background-color: rgba(0, 0, 0, .35);
}

/*左右按钮触碰事件*/

.lr-tab .left:hover {
  background-position-x: 0px;
  background-color: rgba(0, 0, 0, .35);
}

.lr-tab .right:hover {
  background-position-x: -41px;
  background-color: rgba(0, 0, 0, .35);
}

/*圆形按钮属性设定*/

.tab-btn {
  position: absolute;
  right: 40px;
  bottom: 20px;
  width: 120px;
  height: 30px;
  top: 420px;
}

.tab-btn .btn {
  float: left;
  width: 6px;
  height: 6px;
  background: #868686;
  border: 2px solid #c3c3c3;
  /*边框*/
  margin-left: 10px;
  border-radius: 50%;
}

/*圆形按钮触碰事件*/

.tab-btn .btn:hover {
  background: #e4e4e4;
  border-color: #7f7f7f;
}

.tab-btn .active {
  background: #e4e4e4;
  border-color: #7f7f7f;
}
.service{
  margin-top: 20px
}