.banner {
  width: 100%;
  height: 520px;
  overflow: hidden;
  box-sizing: border-box;
  position: relative;
}
.banner_slide {
  width: 100%;
  height: 100%;
}
.banner_slide_item {
  position: absolute;
  opacity: 0;
  transition: all 1s;
}
.banner_slide_item.active {
  opacity: 1;
}
.banner_slide_item img {
  width: 100%;
  height: 520px;
}
/* 圆点 */
.circle {
  display: flex;
  align-items: center;
  height: 20px;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: 20px;
}
.circle .circle_item {
  margin: 0px 5px;
  border-radius: 50%;
  width: 13px;
  height: 13px;
  display: block;
  cursor: pointer;
  background-color: rgb(255, 255, 255);
}
.circle .circle_item.circle_item_hover{
    background-color: rgb(28, 184, 179);
   }
.circle .circle_item:hover {
  background: no-repeat rgb(28, 184, 179);
  margin-top: 1px;
}