Flutter Google Maps。显示样式。我怎么才能让它正常工作呢？

dependencies:
  flutter:
    sdk: flutter
  google_maps_flutter: ^2.0.10

import 'package:google_maps_flutter/google_maps_flutter.dart';

GoogleMap(
  initialCameraPosition: CameraPosition(
    target: LatLng(37.42796133580664, -122.085749655962),
    zoom: 14,
  ),
  markers: Set<Marker>.from([
    Marker(
      markerId: MarkerId("marker_1"),
      position: LatLng(37.42796133580664, -122.085749655962),
      infoWindow: InfoWindow(
        title: "Googleplex",
        snippet: "Google Headquarters",
      ),
    ),
  ]),
)