How to dim a background in react native modal?

I solve this one by create my own component MyPopup like below

class MyPopup extends React.PureComponent {

render() {
    return (
        <Modal 
            animationType="fade"
            transparent={true}
            visible={this.props.visible}
            >
                <View style={{flex: 1, alignItems: 'center', justifyContent: 'center', backgroundColor: 'rgba(0,0,0,0.5)'}}>
                    {this.props.children}
                </View>
        </Modal>
    )
}}

Then I use it like

<MyPopup visible={this.state.modalVisible}>
<View style={{
    width: '90%',
    height: 50,
    borderColor: '#ccc',
    borderWidth: 1,
    borderStyle: 'solid',
    backgroundColor: 'white',
    elevation: 20,
    padding: 10,
    borderRadius: 4,
}}>
    <Text>Hello, This is my model with dim background color</Text>
</View>