Widen One Column, No Sidebar in Twenty Eleven

i edited by child theme’s style.css file to include

.one-column #page {
max-width: 980px;
min-width: 980px;

but it’s not working – it still looks to be about 690 wide.

here’s the page i’m working on:

https://www.wctrust.org/?page_id=1718

help!