Show window size?

I'm trying to position elements of my HUD, but I can't see where the window is in the layout.

As in, I know there's supposed to be a dotted line showing the edges of the window/viewport in the layout, but I just can't see one. Is there a way to make it a massive fricking red line or something? Or maybe it's because my background layer is black, and so is the dotted line, in which case is there a way to change the color of it?

Help is much appreciated!

When making the background transparent I can now see the dotted line, but it would still be useful if I can change the colour so that I can see it against the background normally.

I don't think there is much else you can do aside from un-checking the black layer in order to see the black outline. I don't think you can change the outline color itself. Sorry. :\</p>

OK no problem, cheers.