old_contents: import Toast from 'react-native-root-toast';
  
  export default (text) => {
    Toast.show(text, {
        duration: 1000,
        backgroundColor: 'rgba(0,0,0,.8)',
        position: Toast.positions.BOTTOM
    });
  }
  
new_contents: import Toast from 'react-native-root-toast';
  
  export default (text) => {
    Toast.show(text, {
        duration: 1000,
        backgroundColor: 'rgba(0,0,0,.8)',
        position: -40,
        shadow: false
    });
  }
  
subject: update toast style