how to edit css for one page (k2 theme)

Hi guys I am new using WordPress and just let me say I love it!!

My problem is with this page

https://backatchaphotography.com/about

I am using the k2 theme for my site. I am trying to find out how I can make my text go all the way over to the right. I know this is a css change but I just want this to work on this one page (not site wide). I edited page.php and took out the sidebar and them renamed it to about_page.php and make it a template file. So that page is using about_page.php.

Thanks,
adam