Strange Shadow in TabBar Styles - reactjs

Question

please somebody help me, does anybody know about this strange shadow box in my tab bar? i cant change and its driving me crazy:
So this is my code:
const Tab = createBottomTabNavigator();
export default () => (
<Tab.Navigator
tabBar={props => <CustomTabBar2 {...props} />}
screenOptions={({route}) => ({
headerShown: false,
tabBarShowLabel: true,
tabBarInactiveTintColor: Colors.dark,
tabBarStyle: styles.tabBarStyle,
tabBarActiveTintColor: Colors.primary,
tabBarIcon: ({color, size, focused}) => {
let iconName;
if (route.name === 'Home') {
iconName = focused ? 'ios-home-sharp' : 'ios-home-outline';
} else if (route.name === 'Sequences') {
iconName = focused ? 'settings' : 'settings-outline';
} else if (route.name === 'Animals') {
iconName = focused ? 'wallet' : 'wallet-outline';
} else if (route.name === 'Plants') {
iconName = focused
? 'md-notifications-sharp'
: 'md-notifications-outline';
}
return <Icon name={iconName} size={32} color={color} />;
},
})}>
<Tab.Screen
name="Home"
component={MainStack}
options={{headerShown: false}}
/>
<Tab.Screen
name="Sequences"
component={SequencesStack}
options={{headerShown: false}}
/>
<Tab.Screen name="Animals" component={Animals} />
<Tab.Screen name="Plants" component={Plants} />
</Tab.Navigator>
);
const styles = StyleSheet.create({
tabBarStyle: {
position: 'absolute',
backgroundColor: Colors.transparent,
},
});
and this is the props that im passing to my tab bar
const CustomTabBar = props => {
return (
<View>
<View style={styles.tabBar} />
<BottomTabBar {...props} />
</View>
);
};
export default CustomTabBar;
const styles = StyleSheet.create({
tabBar: {
position: 'absolute',
right: 0,
left: 0,
bottom: 0,
height: 90,
backgroundColor: Colors.white,
borderTopLeftRadius: 35,
borderTopRightRadius: 35,
alignContent: 'center',
justifyContent: 'center',
alignItems: 'center',
alignSelf: 'center',
},
});
I tried to change everything in both sides but i cannot find the styles thats making this shadow between my tabbar, is something wrong or anybody has like a example to show me? Thanks so much