I think there is not much to say. The offset voltage depends on the random mismatch between the Opamp's input pair transistors. This random mismatch is a function of temperature making the offset itself temp dependent and hence ruining the compensation that was done with no offset or constant offset assumption
Thank you for your reply, elbadry.
And i just want to know the magnitude of the offset voltage tempterature drift. how much will it change as the tempterature? several mV or uV?