Elevation in React Native

Here is my style defined in the React-Native screen. I have used the elevation property to achieve a box-shadow. But it's not working properly.

const styles = StyleSheet.create({
scrollContainer: {
    flex: 1,
},
container: {
    flex: 1,
    flexDirection: "row",
    flexWrap: "wrap",
    padding: 2
},
box: {
    margin: 8,
    width: Dimensions.get('window').width / 2 - 18,
    height: Dimensions.get('window').width / 2 - 18,
    justifyContent: "center",
    alignItems: "center",
    borderStyle: 'dashed',
    borderLeftWidth: 1,
    borderTopWidth: 1,
    borderRightWidth: 1,
    borderBottomWidth: 1,
    borderTopColor: 'black',
    borderBottomEndRadius : 8,
    borderTopStartRadius: 8,
    borderTopEndRadius: 8,
    borderBottomStartRadius: 8,
    borderBottomLeftRadius:8,
    borderBottomRightRadius:8,
    elevation: 5
},
navBar:{
    backgroundColor: "#000",
}
});

I have also tried using box-shadow but the same problem arises.

Try to add following properties to the styles.box. You could change the values for better results.

// ...
box: {
  // ...
  shadowColor: '#000',
  shadowOffset: { width: 0, height: 2 },
  shadowOpacity: 0.5,
  shadowRadius: 2,
  elevation: 2,
},
// ...