Border issues with Core theme

[effex]

Hi Guys,

I'm trying to achieve a clean 1px border around everything in the Core theme. I have been playing with the CSS file for a while now and have some mixed results. For the most part I have that 1px border, but there are some areas where it's thicker, about 2px it looks like. Of course, I have played around with it and can't seem to get the desired effect. I have included some screen shots if anyone can help out. Thanks!