[Theme: Twenty Eleven] Page background without messing

#primary

Done.
But now there’s another problem (check the site)

There is a 30px space between menu and content
How can we make it black, or easier, remove it?

Tried it myself but couldn’t figure it out.

Thanks

#main {
    padding: 0;
}

Done. The space is reduced, but still there a bit.
And apart from that, with the space removed, how to apply padding to the widgets?

#access {
    margin: 0 auto;
}
#secondary {
    margin-top: 20px;
}