Finally I ended using (it's also working for different languages of Recaptcha challenges) if someone searches for the same:
">CSS>iframe[src^=' https://www.google.com/recaptcha/api2/bframe ']>FRAME> >CSS>#recaptcha-verify-button"
No, I know that it should appear near taskbar but it didn't, also i was not able to reproduce the error as well, it solved automatically, thanks for the help guys.
