How do i render error messages without increasing form size?

[imperium11]

HI everyone,

I think my title pretty much sums up my problem. I am trying to prevent this from happening:

As you all can see, everything gets thrown off and First Name & Last Name are not on the same line anymore.

Any ideas how to make it so the height of the form never changes?

PS: I tried adding padding, margin etc but when the error message gets rendered it still becomes uneven