const styles = {
    tab: {
        padding: '2px 34px',
        width: '140px',
        height: '72px',
        color: '#4b4b4b'
    },
    tabItemContainer: {
        background: 'none'
    }
}
<Tabs
                        tabItemContainerStyle={styles.tabItemContainer}
                        value={this.state.selectedTab}
                        onChange={this.handleTabChange}>
                        <Tab
                            value={0}
                            buttonStyle={styles.tab}
                            label='Members'/>
                        <Tab
                            value={1}
                            buttonStyle={styles.tab}
                            label='Permissions'/>
                    </Tabs>