Good morning,
I was browsing the UT demo application and like the way the oracle team has used a region in multiple applications like the one below.

Naturally I browsed the elements in Chrome to view how they did this and noticed it was a HERO region. I installed the package application into my work-space & upon doing some digging into the UT application it seems to use the CSS Class dm-hero and span class for the icon. Naturally I assumed I could use these classes in my own application as they must be built in to the work-space when I installed the UT demo application but sadly not. So looking into shared components I cannot find any reference to where the CSS file they used is located or how its called. Pretty sure its called demo.css?v="the apex version using" (I'm messing with 5.1 ea at the moment).
Naturally I can just save this CSS from google chrome use it inline or upload it but I would prefer the knowledge of where about these are located and how do I call them within my applications I made?
The reason I ask is because the Oracle guys have done some some really nice little things we all could utilize there seems little point in replicating if needed.
Thanks in advance