center nav bar–done all the access edits, but still something's off!

I am working in a child theme version of Twenty Eleven.

I’ve centered the nav bar before on other sites, and although I’ve made those suggested changes to the #access and #access ul, there is still something off that is making my nav bar align left (or so it seems to me).

I can’t figure it out!

site: sacredrootsholistichealing.com

Firebug pointed me to:

#branding .only-search + #access div {
    padding-right: 205px;
}

which I added to my child theme’s style.css only to find that it completely disregarded all the color/style edits I have created thus far (made the bar black with white text, as it is in the original twenty eleven)
.

Any of you masters know how to steer me in the right direction?

Thanks in advance!!