@Override
 public BaseConfiguration setMarkingsColorUsedOutline(Color color) {
   return setProperty(key(NamedProperties.MARKINGS_COLOR_USED_OUTLINE), color.toString());
 }
 @Override
 public BaseConfiguration setMarkingsColorUsedBackground(Color color) {
   return setProperty(key(NamedProperties.MARKINGS_COLOR_USED_BACKGROUND), color.toString());
 }