3 columns version in fluid mode

I have installed the 3 this theme in 3 columns fluid mode, at the front page everything is ok, but when you open for read more, the middle section with class INNER does not expand between right and left column. There is a big gap between the inner DIV and Right one. This is happening when you have a posy which is just a short line, for pages full with text this is appeared ok.

I was trying to find the Class INNER in the style file but it was not included. Is there any way I can fix this problem?

One other thing is the layout of front page, how come there is no clear indication (lines, color title or something) between posts on front page?