code: public void setBackgroundIconColorDefault() {
          if (backgroundIcon == null) {
              LOGGER.warn("Background modification skipped because background icon not set!");
              return;
          }
          stopBackgroundIconColorFadeAnimation();
          backgroundIcon.getStyleClass().clear();
          backgroundIcon.getStyleClass().add(JFXConstants.CSS_ICON);
          backgroundFadeIcon.setFill(Color.TRANSPARENT);
      }
docs: Reset the current background icon color to default.