Change bottom modules width

I'm trying to change the width of 8,9 and 10 bottom positions with override css

I added the following code in override.css file but nothing changed

# {gkbottombottom8
width: 59%! important;
}
# {gkbottombottom9
width: 21%! important;
}
# {gkbottombottom10
width: 20%! important;
}

Hi,
Can you give us url to your site?

portfolio.flippo.com.br

Hi Konrad, it's my first experience with the Gavick products, I hope you can understand, and sorry again for open a topic with an obvious and basic question. It wasnt working because the "Enable Override" in Template Manager was disabled.

Thank you,

No problem, this is the place where you should ask