app.js

render() {
    return (
      <div className="container mt-5">
        <div className="row">
          <div className="col-md-4">
            <div className="card-deck">
              {this.state.books.map(movie => <MovieCard {...movie.fields} /> )}
            </div>
          </div>
        </div>
      </div>
    );
  }
}