Problems with percentage height

[DarkHollow]

Hello, I am trying to make a modal 100% of height, or 90% but I cannot get it working well.

I understand that if I put width: 90% I have to put aswell margin-left: -45% but with height is not working well, at fullscreen it is very high and if I resize the window horizontally making it smaller the modal is going down.

Is there any styles to do this?

[diego-feder]

Any updates on this? I'm having a similar problem.