Problem with sidebar and Bbpress

Hi! I installed bbpress but i don’t want it to show left sidebar. How can i adapt it to full width?

Yo can see what i mean here:

http://gestamina.com/foros/foro/novedades/

I used this css code:

#bbpress-forums {
width:100%;
float:left;
}

but there’s still a space at left. I want to put the forum right there.

Thanks!