reduce left padding in menu

Please can anyone help me to make a new style with "0" padding for some menus?

.content_pad {
padding:15px;
}

this is the main style distribution and i need to have an other different, but i cannot make the declaration in the menu cass.

Please any help?

You can use module suffix to distinguish them. Add suffix with first blank char:\

" myspecialmenu"

then in css you can use:

.myspecialmenu .menu{...

to target your menu