mapzen.json

{
    "version": 8,
    "sources": {
        "osm": {
            "type": "vector",
            "tiles": ["https://chopper.boundlessgeo.io/tiles/{z}/{x}/{y}"]
        }
    },
    "layers": [
        {
            "id": "background",
            "type": "background",
            "paint": {
                "background-color": "#41afa5"
            }
        }, {
            "id": "water",
            "type": "fill",
            "source": "osm",
            "source-layer": "water",
            "filter": ["==", "$type", "Polygon"],
            "paint": {
                "fill-color": "#3887be"
            }
        }
    ]
}