Carto CSS

layer {
  marker-width: 7;
  marker-fill: [dominant_color_hex];
  marker-fill-opacity: 0.9;
  marker-line-color: #FFFFFF;
  marker-line-width: 1;
  marker-line-opacity: 1;
  marker-placement: point;
  marker-type: ellipse;
  marker-allow-overlap: true;
}
/** category visualization */
#stack_dummy {
   marker-fill-opacity: 0.9;
   marker-line-color: #424141;
   marker-line-width: 1;
   marker-line-opacity: 1;
   marker-placement: point;
   marker-type: ellipse;
   marker-width: 40;
   marker-height: 32;
   marker-allow-overlap: true;
}
//#stack_dummy {
//   marker-fill: [dominant_color_hex];
//}