message: removed the extra class
diff: @@ -4,6 +4,6 @@ import "./style.css";
  export default class FlatButton extends React.Component {
  render() {
  - return (<button {...this.props} className={classNames("btn", "danger", this.props.className)} />); // eslint-disable-line react/prop-types
  + return (<button {...this.props} className={classNames("btn", this.props.className)} />); // eslint-disable-line react/prop-types
  }
  }
  