Custom props & the design system

This isn't a real "design system", but it's enough to get us started, and gives us some idea of what we'll need to get started.

The information that it lays out for us is perfect for creating some custom properties and helping us get started a lot faster.

In the real world, you might be working from a much more robust design system, or you might end up with a design file that doesn't have one at all.

We always have to make due with what we have. The more robust it is, the easier it is to work, but if you get projects where you don't have any, this is a good idea of the bare minimum you should go looking for in the design before you get started, so you can create a small system yourself to bring into your CSS.