What bright line are you referring to? I've not seen a bright line down the middle of anything; that sounds like a glitch on your machine, to be honest. Driver issue or corrupt install or something. Or something we just haven't seen from being used to it if its that subtle; do you have a screenshot of the issue?
Regarding a larger font, generally speaking that's not something we can so without really redesigning all the windows and/or making them not fit on the screen. However, please let me know what areas of the game this actually applies to (there are several fonts at several sizes in the game) and we'll at least look at it.