removing border stying

[katawura]

I am trying to remove the bottom border styling from the form so got this in place

                            formStyles={{
                                TextInputWidget: {
                                    underlineIdle: {
                                        borderBottomWidth: 2,
                                        borderColor: 'red',
                                    },
                                    underlineFocused: {
                                        borderBottomWidth: 2,
                                        borderColor: '#3498db',
                                    },
                                },
                            }}

But doesn't seem to work. Any ideas?