<View style={styles.container}>
            <TouchableOpacity
                style={styles.button}
                onPress={this.onButtonPressed}
            >
                <Text style={styles.text}>{this.props.children}</Text>
            </TouchableOpacity>
        </View>

button: {
    alignItems: 'center',
    justifyContent: 'center',
    backgroundColor: "rgba(65, 99, 12, 0.7)",
    zIndex: 100,
}

<Button style={styles.button || styles.registerButton}>
                    <Text>Register</Text>
                </Button>

registerButton: {
    backgroundColor: 'rgba(65, 87, 159, 0.7)',
    width: 140,
    height: 28,
}