Background under article

Hello.
My site: http://freeamericatoday.pl

I have a problem with background under articles. Now it looks like that: http://freeamericatoday.pl/Inne-polskie ... kreca.html

I want ot to look like in image: (grey background from left to right under article tools) How can I do this?

EDIT:
OK, I made it.
In template.css add

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background:#colornumber;

in:

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#gk-current-content{float:right;}

so it should look like that:

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#gk-current-content{float:right; background:#colornumber;}