Generic CartoCSS style

style.css

/* Points */
#layer['mapnik::geometry_type'=1] {
  marker-width: 7;
  marker-fill: #FFB927;
  marker-fill-opacity: 0.9;
  marker-line-color: #FFF;
  marker-line-width: 1;
  marker-line-opacity: 1;
  marker-placement: point;
  marker-type: ellipse;
  marker-allow-overlap: true;
}
/* Lines */
#layer['mapnik::geometry_type'=2] {
  line-color: #3EBCAE;
  line-width: 1.5;
  line-opacity: 1;
}
/* Polygons */
#layer['mapnik::geometry_type'=3] {
  polygon-fill: #374C70;
  polygon-opacity: 0.9;
  polygon-gamma: 0.5;
  line-color: #FFF;
  line-width: 1;
  line-opacity: 0.5;
  line-comp-op: soft-light;
}