react-component.js

import React from 'react';
import 'ExampleComponent.css';

export default class ExampleComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = { message: 'Hello from component!' };
  }

  render() {
    return (
      <div className="container">
        <p>{this.state.message}</p>
      </div>
    );
  }
}