reader/custom-tab-bar/index.wxss

.tab-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: white;
  display: flex;
  box-sizing: border-box;
  padding: 14rpx 0rpx;
  padding-bottom: calc(env(safe-area-inset-bottom) + 14rpx);
  box-shadow: rgba(0, 0, 0, 0.35) 0px 30rpx 20rpx 20rpx;
}
.tab-bar .tab-bar-item {
  position: relative;
  flex: 1;
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  padding-bottom: 10rpx;
}
.tab-bar .tab-bar-item .noticeTips {
  position: absolute;
  left: 100rpx;
  top: -12rpx;
  width: 28rpx;
  padding: 4rpx 0rpx;
  border-radius: 40rpx;
  color: white;
  font-size: 16rpx;
  text-align: center;
  background-color: #FF0000;
}
.tab-bar .tab-bar-item image {
  width: 48rpx;
  height: 48rpx;
}
.tab-bar .tab-bar-item view {
  font-size: 28rpx;
  margin-top: 10rpx;
}
.tab-bar .mask {
  position: absolute;
  top: 0rpx;
  width: 100%;
  height: 100%;
  z-index: 9;
  background: rgba(0, 0, 0, 0.7);
}