Issue with minimal theme outside Panel

Folllowing the tutorial (https://whizzy.dev/themes/minimal) i get an error stating:

The `bg-primary-100` class does not exist. If `bg-primary-100` is a custom class, make sure it is defined within a `@layer` directive.

The `bg-primary-100` class does not exist. If `bg-primary-100` is a custom class, make sure it is defined within a `@layer` directive.

The `bg-primary-100` class does not exist. If `bg-primary-100` is a custom class, make sure it is defined within a `@layer` directive.

The `bg-primary-100` class does not exist. If `bg-primary-100` is a custom class, make sure it is defined within a `@layer` directive.

I'm a bit confused; puting the import prior to tailwind's definition fails too