Background color of webview body is always white about highcharts-react-native HOT 3 CLOSED

                <HighchartsReactNative
                    styles={styles.container}
                    options={this.state.chartOptions}
                    webviewStyles={{backgroundColor: 'transparent'}}
                />

const styles = StyleSheet.create({
    container: {
        justifyContent: 'center',
        backgroundColor: 'orange'
    },
    button: {
        justifyContent: 'center'
    }
});

this.state = {
            chartOptions: {
                series: [{
                    name: 'Speed',
                    data: [1, 10, 3]
                }],
                chart: {
                    backgroundColor: 'transparent',
                    type: 'line'
                }
            }
        };