EasySocial - css - overall font size - increase as a percentage

I'm not having any success changing the overall font size in EasySocial. In EasyBlog, I can add to our template's custom.css the following which works:

body {
font-family: 'Raleway', sans-serif;
font-size: 120%;
line-height: 23px;
}

Since ES doesn't change per the font-size "body" selectors, is there an equivalent (which one) container that I should use to change the overall font-size similar to EB?

Thanks. -- Rik