ant-design/components/notification/demo/custom-style.tsx

import React from 'react';
import { Button, notification } from 'antd';

const App: React.FC = () => {
  const [api, contextHolder] = notification.useNotification();

  const openNotification = () => {
    api.open({
      message: 'Notification Title',
      description:
        'This is the content of the notification. This is the content of the notification. This is the content of the notification.',
      className: 'custom-class',
      style: {
        width: 600,
      },
    });
  };

  return (
    <>
      {contextHolder}
      <Button type="primary" onClick={openNotification}>
        Open the notification box
      </Button>
    </>
  );
};
export default App;