[Theme: Clever Course] Overriding parent CSS / specificity

I’ve been using GoodLayers support but they won’t assist with customization and my problem is a bit random. Basically I’m attempting to change a few things in my child theme stylesheet but they are not overriding at all or being detected in the theme.

The mockup page is here:
https://www.esfeducation.com/exsf/house-system

When I change the code in the original theme stylesheet it works fine, but as soon as I copy and paste it to the child theme it doesn’t change anything and doesn’t even show up in the dev tools inspector.

I’m trying to change the title and the breadcrumbs but the whole area is not affected by the child theme stylesheet.

I have a real suspicion that I’m not being specific enough (or too specific) but at this point I’ve tried everything I can think of and nothing is changing. Any help would be greatly appreciated