image-juicer/app/containers/App.js

import React, { PureComponent } from 'react';

export default class App extends PureComponent {
  render() {
    return (
      <div className="window">
        <header className="toolbar toolbar-header">
          <h1 className="title">Header</h1>
        </header>
        <main className="window-content">
          {this.props.children}
        </main>
        <footer className="toolbar toolbar-footer">
          <h1 className="title">Footer</h1>
        </footer>
      </div>
    );
  }
}