Default body font size of Vanatge theme

Hi,
I would really appreciate you helping me become more clear on this:

The docs for the Vantage theme at:

Fonts

say:

Content Size
Change the font size of your site’s main content, defaults to 13px.

BUt when I use Inspect element in any browser to see what font size is actualy being aplied, I see:

html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, font, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td {
    font-size: 100%;
    }

and this is being set by the Vantage theme style.css on line 71.

So the docs says 13px and the actual style being applied is 100%.

Furthermore, I find that links inside sidebar widgets, which in most other themes are set to the same size of the body text, in the Vantage theme they are smaller than the body text.

Also, in Customizer I do not see a way to set sizes of fonts inside widgets.

I am used to, and would like to set the html body font to a certain size, and have that apply to all normal text in the theme, including widget links and text.

So I getting a bit mixed up in the case of the Vanatge theme. If I set a size in the Customizer, which is in px, I still see 100% in the actuall css. And I cannot set an overal text size for all text including widget text, and I cannot seem to set widget text size in the customizer.

Furthermore, I am finding that if apply custom css to widget text, this only seems to work in certain widgets in the sidebar (but not all of them) and does not apply the style to footer widget text.

What makes it even more complex is that if I have a link or text inside a Siteorigin page builder widget, then that text is not styled as normal text and so it is a different size, even though is should appear to be the same size…

So I was thinking I should reset the Customizaton of the theme, and set a font size in custom css, but then it seems the default px sizes of the theme will over-ride this.

I would like to set a single size for all normal text in pages, widget text, widget links, in either the customizer or in custom css – is this possible?