As this package is intended for react-apps, the css file for ladda buttons must be included in the react-ladda package so that one can perform clean imports / builds in projects that use webpack + css-modules for managing CSS.
Example Usage from my app's App.js:
...
// imports of CSS styles of 3rd-party packages
import 'font-awesome/css/font-awesome.min.css';
import 'rc-slider/assets/index.css';
import 'react-datepicker/dist/react-datepicker.css';
import 'react-select/dist/react-select.css';