Flags dropdown not visible in remix application

[RajeshP27]

The Dropdown not showing flags in remix application using react . As shown below image

code :-
import React, { useState } from 'react';
import PhoneInput from 'react-phone-input-2';
import 'react-phone-input-2/lib/plain.css';
import 'react-phone-input-2/lib/bootstrap.css'
const UnifiedPhoneInput: React.FC = () => {
const [phoneNumber, setPhoneNumber] = useState('');

const handleOnChange = (value: string, country: any) => {
setPhoneNumber(value);
};

return (

<PhoneInput
country={'US'}
value={phoneNumber}
onChange={handleOnChange}
inputProps={{
name: 'phone',
required: true,
autoFocus: true,
}}
/>

);
};

export default UnifiedPhoneInput;