.banner {
  /*width: 700px;*/
  /* border: 1px solid red;*/
  /*margin: 100px auto;*/
  position: relative;
  /*height: 700px;*/
   overflow: hidden;
}

.item img {
  width: 100%;
  height: 100%;
  vertical-align: top;
}

.item {
  width: 100%;
  height: 100%;
  position: absolute;
  opacity: 0;
}

.item:first-child {
  opacity: 1;
}

.banner .wrap {
  /* width:2800px ; */
  /* border: 1px solid green; */
  height: 700px;

}

.pagenation {
  position: absolute;
  /* border: 1px solid red; */
  left: 50%;=
  transform: translateX(-50%);
  display: flex;
  /*display: none;*/
  bottom: 20px;
}

.pagenation > div {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: grey;
  margin-right: 10px;
  cursor: pointer;
}

.pagenation > div:last-child {
  margin-right: 0;
}

.pagenation > div:first-child {
  background: purple;
}

.goon {
  width: 0px;
  height: 0px;
  /* background-color: pink; */
  /*border-top: 25px solid transparent;*/
  /*border-right: 25px solid pink;*/
  /*border-bottom: 25px solid transparent;*/
  /*border-left: 25px solid transparent;*/
  opacity: 0.5;
  position: absolute;
  top: 45%;
  cursor: pointer;
  left: 30px;
}

.goout {
  width: 0px;
  height: 0px;
  /*border-top: 25px solid transparent;*/
  /*border-right: 25px solid transparent;*/
  /*border-bottom: 25px solid transparent;*/
  /*border-left: 25px solid pink;*/
  opacity: 0.5;
  position: absolute;
  top: 45%;
  right: 60px;
  cursor: pointer;
}