JavaFx: Checkbox unwanted "background"

I am looking for to remove the background of a checkbox because it takes space in a TableCell and it causes that the CheckBox is not centered.

As you can see if the background is marked red, it exceeds the checkbox and takes space.

Here is a minimal code you can verify it and the screenshoot:

Controller:

public class Controller implements Initializable {

    @FXML
    private TableColumn<Object,String> one;
    @FXML
    private TableView<Object> table;

    @Override
    public void initialize(URL location, ResourceBundle resources) {
        one.setCellFactory(cell -> new CheckBoxTableCell<Object, String>(){
            @Override
            public void updateItem(String item, boolean empty) {
                super.updateItem(item, empty);
                if(empty){
                    return;
                }
                CheckBox graphic = (CheckBox) getGraphic();
                graphic.setStyle("-fx-background-color: red");
            }
        });
        table.getItems().add(new Object());
    }
}

I would like to eliminate the red part so only keeping the box itself.

I tried to reset the padding for it but it doesn't work. Can you help me?

Note: I won't accept setPadding(new Insets(0,-x,-y,0) so setting negative values to it to compensate the "error" only in that case if you can explain it why it is the only solution.