I will need to create a major update to this theme to make the fonts more consistent and to change the rem values to em’s instead. This is a relative size which means if you make your body font size in a percent, such as 110%, then the rest of the content in the page will adjust the their font size to be relative to that 110%. It’s a bit techy I know, but this is actually the correct way to create sizing in themes nowadays…to be relative. Using px sizes whether fonts or paddings, etc., do not change if you change the body base size because using px is a “fixed” size, meaning it won’t change.
Normally for any modifications, the child theme is where you would do it, but because of how I coded the theme, I need to make that change. One thing you can do if you want to keep everything to the child theme for now, is to make that above change I posted in the child theme (which actually might be better for the time being until I do the theme update later). Basically you would do this in your child theme style.css: