basemap_example.mapcss

<?xml version="1.0"?>
<!DOCTYPE Map>
<Map srs="+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +no_defs +over" background-color="#0055ff">

<!-- Coastlines -->
<!-- Download Land Polygons (Large polygons split, Simplified not split) from http://openstreetmapdata.com/data in Mercator projection and unzipped in data/. -->
  <Style name="coastpoly">
    <Rule>
      <PolygonSymbolizer fill="#f2efd9" />
    </Rule>
  </Style>

  <Layer
    srs="+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +no_defs +over"
    maxzoom="1500001"
  >
    <StyleName>coastpoly</StyleName>
    <Datasource>
      <Parameter name="type">shape</Parameter>
      <Parameter name="file">data/land-polygons-split-3857/land_polygons.shp</Parameter>
    </Datasource>
  </Layer>

<!-- MapCSS style definition -->
  <style type='text/mapcss'>
node|z5-[place=city] {
  text: name;
}
node|z10-[place=town] {
  text: name;
}
node|z13[place=village] {
  text: name;
}
  </style>
</Map>