elevation is not working for

BottomNavigation

bottomBar = {
            BottomNavigation(
                elevation = 16.dp,
                backgroundColor = MaterialTheme.colors.surface,
                contentColor = MaterialTheme.colors.onSurface
            ) {
                BottomNavigationItem(icon = {Icon(asset = Icons.Outlined.Home)}, selected = true, onClick = {})
                BottomNavigationItem(icon = {Icon(asset = Icons.Outlined.Search)}, selected = false, onClick = {})
                BottomNavigationItem(icon = {Icon(asset = Icons.Outlined.Person)}, selected = false, onClick = {})
            }
        }