* {
  padding: 0;
  margin: 0;
}
li {
  list-style: none;
}
.boss {
  width: 90%;
  margin: 50px auto;
  position: relative;
  height: 420px;
  background: #fff;
}
.swiper div {
  width: 100%;
  height: 450px;
  display: none;
}
.swiper div img {
  width: 100%;
  height: 350px;
}
.swiper .active {
  display: block;
}
.nav {
  position: absolute;
  bottom: 20px;
  left: 20px;
}
.nav li {
  float: left;
  margin: 0 10px;
  width: 30px;
  height: 30px;
  background-color: rgb(105, 248, 255);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav .active {
  background-color: rgb(0, 128, 62);
  color: #fff;
}
 .spantitle {
  color: rgb(3, 116, 110);
  font-size: 18px;
  font-weight: 550;
}