I have download a shapefile from OpenStreetMap (OSM), then I open it using TileMill. The next step is create stylesheet ".mss" file.
How can I download the exact OSM's stylesheet?
The OSM stylesheet is on github : https://github.com/gravitystorm/openstreetmap-carto
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OSM uses (-ed) the native Mapnik XML stylesheets, while Tilemill uses CartoCSS as style language. You need to get a converted map style file here: https://wiki.openstreetmap.org/wiki/CartoCSS