Yes, you can. I am running using a child theme.
Follow this guide. https://codex.ww.wp.xz.cn/Child_Themes
Don’t bother trying to create a new CSS. Just copy the original to the child theme folder and edit from there.
Good luck and YEMV
Following my post, I did another round of checks and I found the search and social icons missing from the header.
After some poking around, I have decided to use a far simpler method.
Attitude offers CSS overrides.
http://www.themehorse.com/support-forum/topic/header-menu-and-social-icon/
So I use the following to make the font bigger. A sanity test is to make the size artificially big say 27 and see on screen where it balloons out.
body, input, textarea {
font: 17px ‘PT Sans’, sans-serif;
}
Good luck and YEMV
I have been trying to make some customizations to this theme, first by using the custom css box, and then I created a child theme. It seems like the child theme css is not always overriding the parent, and a lot of the code I wrote in the custom box did not work either. This is not the first time I’ve created a child theme, but this is the first time I’ve had so much trouble getting the code to work. Npalexande, did you ever get it to work?