This project was bootstrapped with Create React App.
The relavant component file can be found in src/Expander.js.
From the project directory, you have two options:
$ npm i
$ npm start
Runs the app in the development mode.
Open http://localhost:3000 to view it in the browser.
Navigate to build folder in project directory, then from terminal run:
$ php -S localhost:3000
Starts pre-built demo running at http://localhost:3000