App.js

import React, { Component } from 'react';
import './App.css';

class App extends Component {
  constructor(props) {
    super(props);
    this.state = { skin: 'night' };
  }
  
  render() {
    return (
      <div>
        <header className="App-header">
          <p style={{ fontSize: '50px', cursor: 'pointer' }}>Change Skin</p>
        </header>
      </div>
    );
  }
}

export default App;