code: void addCSSIfAvailable(final Parent parent) {
  
  		// Read global css when available:
  		final List<String> list = PropertyReaderHelper.get(applicationContext.getEnvironment(), "javafx.css");
  		if (!list.isEmpty()) {
  			list.forEach(css -> parent.getStylesheets().add(getClass().getResource(css).toExternalForm()));
  		}
  
  		addCSSFromAnnotation(parent);
  
  		final URL uri = getClass().getResource(getStyleSheetName());
  		if (uri == null) {
  			return;
  		}
  
  		final String uriToCss = uri.toExternalForm();
  		parent.getStylesheets().add(uriToCss);
  	}
docs: Adds the CSS if available.
  
  @param parent
  the parent