Yes, Courtnie's suggestion is only for the left column. The class ".innertube" is used for both the left column and the content column. So if you change Courtnie's suggestion to the one below, it should work in both areas.
Thank-you so much Philo and Courtnie, much appreciated.
The page looks as I wished, it's slightly better in Firefox as the main content items are spaced slightly away from the left columns but both are fine. Although whether it's just my monitor but I'm getting some weird looking light green specks down the right hand side of the page near the scroll bar in Firefox
Thanks again
Stephen
