ox://styles/mapbox/dark-v9',
                    /* style: {
        "version": 8,
        "sources": {
          "mapbox-tiles": {
            "type": "raster",
            'tiles': [
              "https://api.tiles.mapbox.com/v4/mapbox.dark/{z}/{x}/{y}.png?access_token=sk.eyJ1IjoiY2hlbmdkYWRhIiwiYSI6ImNqZDFjaGo0ZjFzcnoyeG54enoxdnNuZHUifQ.hTWXXBUQ0wdGeuDF3GWeUw"
            ],
            'tileSize': 256
          }
        },
        "layers": [{
          "id": "dark-tiles",
          "type": "raster",
