100% menu height and random margin problem

I'm designing my first website and I'm facing some problems. I've researched a lot, but can't really fix my problem...

I want the site to be fluidly resizable - I hate having a 1920x1080 screen and seeing every site consisting only of a small, centered rectangle, using 20% of the available space.

The problems are:
There's some kind of margin between the content and the menu I can't seem to get rid of. When the menu stops (which is another problem), that margin goes away...
How can I fix this? I want to be able to control the margin.

menu - content (scrolled) - status

Hello there,

I'm having trouble with a layout - it's a menu - content (scrolling) - status layout which I've tried to achieve through a single table:

| Menubar |
| Content | |
| | | <- Scrollbar
| | |
| | |

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