customizing terms of service appearance

Hi I want to change the size of the “terms of service” that shows up on the “create an account” page.

Currently, I think the box looks too big and bulky, and even though it has a scroll function, I would love for it to be a little shorter in height.

Is there any way to change this with little coding? I am not great at changing the code using ftp files and whatnot.

Much appreciated!