body{
  margin: 0;
  padding: 0;
}

.banner-container{
  position: relative;
  width: 100%;
  height: 200px;
  overflow: hidden;
}

.banner-content{
  position: relative;
  height: 100%;
}

.item{
  height: 100%;
  float: left;
}

.item img{
  width: 100%;
  height: 100%;
}

.banner-switch{
  position: absolute;
  bottom: 10px;
  width: 100%;
  height: 7px;
  display: flex;
  justify-content: center;
}

.bullet{
  width: 7px;
  height: 7px;
  border-radius: 50%;
  margin: 0 3px;
  background-color: hsla(0,0%,100%,.5);
}

.bullet.active{
  background-color: #fff;
}