react-datepicker version 4.1.1. year drop down header arrow not showing up

Question

Even same issue we can see in documentation react-datepicker year dropdown. I know it's version specific issue as it's working fine in lower version. Any solution for this version?

() => {
  const [startDate, setStartDate] = useState(new Date());
  return (
    <DatePicker
      selected={startDate}
      onChange={(date) => setStartDate(date)}
      showYearDropdown
      dateFormatCalendar="MMMM"
      yearDropdownItemNumber={15}
      scrollableYearDropdown
    />
  );
};

Answer 1

Year drop down have react-datepicker__year-dropdown class in css. So we can create a custom style and select the year dropdown based on this class and add the arrow icon. Custom styles will be:

.react-datepicker__year-dropdown .react-datepicker__year-option:first-child::before {
  content: "\25B2";
  position: absolute;
  top: 5%;
  left: 45%;
  margin: auto;
}

.react-datepicker__year-dropdown::after {
  content: "\25BC";
  display: block;
  position: relative;
  bottom: 15%;
}

Assume DatePicker component's code is same as bellow:

import { useState } from "react";
import "./styles.css";
import DatePicker from "react-datepicker";
import "react-datepicker/dist/react-datepicker.css";

export default function App() {
  const [startDate, setStartDate] = useState(new Date());
  return (
    <DatePicker
      selected={startDate}
      onChange={(date) => setStartDate(date)}
      showYearDropdown
      dateFormatCalendar="MMMM"
      yearDropdownItemNumber={15}
      scrollableYearDropdown
    />
  );
}

We add our styles in styles.css.