CODE EXAMPLE FOR JAVASCRIPT

react-datepicker

() => {
  const [startDate, setStartDate] = useState(new Date());
  const MyContainer = ({ className, children }) => {
    return (
      <div style={{ padding: "16px", background: "#216ba5", color: "#fff" }}>
        <CalendarContainer className={className}>
          <div style={{ background: "#f0f0f0" }}>
            What is your favorite day?
          </div>
          <div style={{ position: "relative" }}>{children}</div>
        </CalendarContainer>
      </div>
    );
  };
  return (
    <DatePicker
      selected={startDate}
      onChange={(date) => setStartDate(date)}
      calendarContainer={MyContainer}
    />
  );
};