6pt is as thick as you can make the border. The only way to make it 'appear' thicker is to reduce the font size and zoom the page larger. If your text is 6pt then the borders will look a lot fatter than when the text is 12pt.

The border colour discrepancy is not because the line is partially transparent - Word can't do that. I think the issue you are seeing is that the background is in the header/footer layer and therefore is faded on screen. When you print it or show it in Print Preview you will see that the background and border is actually the same colour.

Making the border colourless would render this entire thread pointless. If it is important for you to not see the borders on screen or in print, why did you start this thread?

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Andrew Lockton
Chrysalis Design, Melbourne Australia