Optional
If you don't want to display a stroke, you can set the color to
transparent
StyleDefault.DEFAULT_OVERLAY_STROKE_COLOR
IMPORTANT: this property is currently not taken into account by the default Overlay. See https://github.com/process-analytics/bpmn-visualization-js/issues/1234
StyleDefault.DEFAULT_OVERLAY_STROKE_WIDTH
If you don't want to display a stroke, you can set the color to
transparent