//step 1 ) create the errors/404.blade.php in view.

// step 2 ) go to Handler.php and replace the render function to belwo function.
  public function render($request, Throwable $exception)
    {
        if ($exception instanceof AccessDeniedHttpException) {
            return response(view('errors.404'), 404);
        }
        return parent::render($request, $exception);
    }