Change main menu continer via stylecss

Hi there!

I would like to change the color of the main menu background, I tired via style.css:

#mainmenu-container {
clear:both;
padding-bottom:10px;
background:#262626;
}

but it won't work. What can be the matter?

Thanks a lot!
Orsi

Hi, there!
It depends on the theme you use. What theme do you use?