I have a feeling the answer to this is "you can't", but I'll ask anyway because some of my users don't like this. Neither do I, actually, and I can't figure out why it would happen like this.
We have tables with a black border around the outside and a thin grey border separating the rows and columns. The grey row border line intersects and overlays the black table border, so it looks like a series of dashed lines (if you zoom in enough). Oddly, the column borders do not do the same thing: the table border at the top and bottom are uninterrupted. See graphics.
Image may be NSFW.
Clik here to view.Image may be NSFW.
Clik here to view.
So why is this, and is there any way to fix it?