twong329/view/xcx/pages/user_bill/index.wxss

.bill-details .nav {
  background-color: #fff;
  height: 90rpx;
  width: 100%;
  line-height: 90rpx;
}

.bill-details .nav .item {
  flex: 1;
  text-align: center;
  font-size: 30rpx;
  color: #282828;
}

.bill-details .nav .item.on {
  color: #e93323;
  border-bottom: 3rpx solid #e93323;
}