How set background color for forms?

[hey-mx]

Hi,

I am trying to set a background color for my app (in this case black) but when I have a form in the screen this always has a white column ( I have attached an image)

The code that I have is the next:

    render() {
        return (
            <Container style={{backgroundColor: 'black'}}>
                <Header />
                <Content style={{backgroundColor: 'black'}}>
                    <Form>
                        <Item>
                            <Input placeholder="Email" onChangeText={ email => this.setState({ email }) }/>
                        </Item>
                        <Item>
                            <Input placeholder="Contraseña" secureTextEntry={ true } onChangeText={ password => this.setState({ password }) }/>
                        </Item>
                    </Form>
                    <Button title="Ingresar" onPress={ this.handleLogin } style={{marginButtom: 40}}/>
                    <TouchableHighlight onPress={ this.handleFacebookLogin } style={Styles.facebookButton}>
                        <View style={Styles.facebookButtonView} >
                            <Icon name="logo-facebook" size={30} color="white" style={{marginRight: 5,}}/>
                            <Text style={Styles.facebookButtonText}>INGRESA CON FACEBOOK</Text>
                        </View>
                    </TouchableHighlight>
                </Content>
            </Container>
        );
    }

I have tried some steps like set the background for each for item but still with the same behavior.
Thanks in advance.