Font size only for text

Hi There,
I changed in settings / styles / customizer font size and seems headers are the only to change, is it possible to make the size of the text bigger and keep the same size of the headers?
the screenshot attached shows that headers changed, but paragraph didn't.

Thanks

Hi there,
you can do this maybe only with css/custom.css
How to find the css classes
www.joomlaplates.com/template-customizing