if #available(iOS 15, *) {
// For navigation Bar
let Nav_appearance = UINavigationBarAppearance()
Nav_appearance.configureWithOpaqueBackground()
Nav_appearance.backgroundColor = .systemYellow
navigationController?.navigationBar.standardAppearance = Nav_appearance
navigationController?.navigationBar.scrollEdgeAppearance = navigationController?.navigationBar.standardAppearance
// For Tab bar controller
let Tab_appearance = UITabBarAppearance()
Tab_appearance.configureWithOpaqueBackground()
Tab_appearance.backgroundColor = .systemYellow
tabBarController?.tabBar.standardAppearance = Tab_appearance
tabBarController?.tabBar.scrollEdgeAppearance = Tab_appearance
}