How to remove "footer_bg.png" from contains

you can add suffix to module and apply styling only to it.

suffix = " my_styling"

then add styling for it :

.my_styling{
...
}

I tried... but this backround remains,
Could give me an idea how to do it exacly?

I just checked your site, that is not our template!

What do you mean?
The problem is not from your template?

sorry i don't know what i looked back then but somehow I saw like that is not our template.

Add this suffix to module :
" nobcg"

then add this css to bottom of template_css.css

.nobcg *{
background:none!important;
}