In the latest production version, in the following code,
srcTitle.setStyle("-fx-border-color: red;"); results in a red border around the textfield srcTitle, but a subsequent call setStyle(null) or setStyle("") does NOT set it back to the default.
It stays red.

    public void handleSrcSave() throws IOException {
        log.debug("Entering handleSrcSave()");
        srcTitle.setStyle("");

        if (getCurrentSource().getTitle() == null
                || getCurrentSource().getTitle().isEmpty()) {
            srcTitle.setStyle("-fx-border-color: red;");
            MessageController.showMessage(srcTitle.getScene().getWindow(), MessageController.ERROR, "A Source Title is required.");

        } else if (getCurrentSource().getTitle().length() > 40) {
            srcTitle.setStyle("-fx-border-color: red;");
            MessageController.showMessage(srcTitle.getScene().getWindow(), MessageController.ERROR, "A Source Title is limited to 40 characters.");

        } else {
            new Thread(new SourceDbTask(srcTitle.getScene().getWindow(), mySource, "U")).start();
        }
        log.debug("Exiting handleSrcSave()");
    }