I've tried to put a transparent background, but then, the seas are transparent too, and i don't want that. I just want transparent land, and blue seas ...


1 . download shape of oceans there (mercator) http://openstreetmapdata.com/data/water-polygons

2 . adjust project.yaml

- id: "oceans"
    name: "oceans"
    class: ""
    geometry: "polygon"
    <<: *extents
      file: "data/water-polygons-split-3857/water_polygons.shp"
      type: "shape"
    advanced: {}

3 . adjust shapefile.mms

#oceans {
  [zoom >= 0][zoom < 20]{
    polygon-fill: @water-color;

4 . generatetiles

enter image description here

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