cannot change default font size using page builder or custom css plugin

i’m using the pagebuilder on a woothemes theme Canvas. For the most part, things are working pretty well. However I’m running into one baffling issue.

I cannot change the default font size. Canvas has its own settings, and I have adjusted those, but those seem to be overridden by siteorigin somewhere. When I use siteorigin custom css, I cannot make any change at all to the font size of the p text in the siteorigin editor widgets on pages. I have tried adding this code and playing with font sizes manually but it did nothing (I used a big size so I could undeniably see an effect if it worked):

.entry-content p {
font-size: 24px;
}

URL: http://uprighthealth.com/do-it-yourself-programs/