reader/components/banner/index.wxss

.header {
  position: relative;
}
.header .headerBg {
  position: absolute;
  z-index: -2;
  width: 100%;
  height: 100%;
  background-color: white;
}
.header .swiper {
  margin: 0 auto;
  width: 710rpx;
  height: 216rpx;
  border-radius: 20rpx;
  overflow: hidden;
  box-shadow: rgba(0, 0, 0, 0.1) 0px 4px 6px -1px, rgba(0, 0, 0, 0.06) 0px 2px 4px -1px;
}
.header .swiper .swiper-item {
  width: 100%;
  height: 100%;
  border-radius: 20rpx;
  overflow: hidden;
  object-fit: cover;
}