Can someone who knows CSS scripting, please write a script for displaying the forum using widescreen?

Back when the forums turned to CSS scripting, those of us with widescreens had the forum squished into the middle instead of spread out across the widescreen monitor.

There was a CSS forum back then and several people wrote CSS scripts for widescreen monitor display. I had been using one. And it was working fine until yesterday when my forum started to display like the above picture:

Stacey discovered that removing the CSS from the forum options CSS style box corrected the problem. So I've done that.   But now I have small monitor display instead of wide screen display for the forums. Basically everything is squished in the middle with huge wide borders to the sides.

The way my forum was displaying until yesterday was like in the above image, only the forum  extended to the very edge of the right sidebar.  Basically, it filled my entire computer screen from left to right. 

I would like it to be returned to that display.  Only I've now lost the CSS code that I had been using, not that it was working anymore.

I cannot see the CSS forum anymore so I can't locate the scripting.

Can someone who knows CSS please write a script that will display the forums in widescreen view?

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi