IE8 > background spills out > overflow: hidden partialy fixes it

Hello,
I have a problem appearing only in IE8, but I don't seem to find the exact bug and solution.

In this page
http://www.cracowflats.com/index.php/search/show/id/181

there is a Details area (bottom left) where titles have a green background.
For some reason this green background appears in other parts of the page.
In other browsers, the whole page has a white background, as it should.

1) With this code in theme.css

a {color:#62860b; }
h3, h4 { color: #70af1d;}
.color_title { background: #76a637;color:#fff;}
.logo h1 a { color: #62860b !important;}

it appers everywhere and the whole background of the page is green (should be white).

2) when I add an "overflow: hidden;" here

.color_title { background: #76a637;color:#fff; overflow: hidden;}

it gets better, as the main area is white.
But I still have a lot of green on the footer (and tabs).

If I could find out to which bug it refers, it would be easier to find a solution.
Any hint would be appreciated!

Thanks!

Luca