Code to reproduce :

@Override
    public void start(Stage stage) throws Exception {
        BorderPane root = new BorderPane();
        final CheckBox checkbox = CheckBoxBuilder.create().text("Check box the first line" +
                "\nthe sec long line" + "\nthe third line")
                    .graphic(new Rectangle(20, 20, Color.web("lightblue")))
                        .focusTraversable(false).build();
        Scene scene = new Scene(root, 500, 500);
        checkbox.setMinSize(500, 150);
        ChoiceBox choiceBox = new ChoiceBox();
        choiceBox.getItems().addAll(Pos.values());
        choiceBox.valueProperty().addListener(new ChangeListener() {
            @Override
            public void changed(ObservableValue observableValue, Object o, Object o2) {
                checkbox.setStyle("-fx-border-color:green;-fx-alignment:" + o2 + ";");
            }
        });
        root.setTop(choiceBox);
        root.setCenter(checkbox);
        stage.setScene(scene);
        stage.show();
        stage.setTitle(VersionInfo.getRuntimeVersion());
    }