Loopstudios homepage || HTML && CSS only

this was one really fun challenge, but i got a particular problem too, in the footer nav menu theres a ::after effect that jumps in on hover, once the mouse is out of the box it cames back to his original value width:0, sweet but theres a pixel that stays and i dunno why, heigh:0 solves the problem but damaging the transition if someone could help me out on this one or at leats explain me what is happening, thanks