Widen navigation panel and remove padding in CenterRow

I’ve created an exhibit using the CenterRow theme. The exhibit has rather long section titles that appear clunky in the navigation panel on the left. I’d like to widen the navigation panel and / or remove the container padding so that the section names don’t split across so many lines. I’m a relative newbie and have been trying to get the code right to add into the CSS Editor. From running page inspect it appears the CenterRow theme has a #wrap container redistricting all widths on the page.

#wrap {
    max-width: 1100px;
    margin: auto;
    position: relative;
    padding: 0 5.2631578947%;

I’d greatly appreciate any help!