Add important Drupal base css from a starterkit theme

Problem/Motivation

Drupal base styles, e.g. field--label-inline don't seem to exist in the theme, but I guess these basic things should be present?

Unsure how to do it best practice, maybe inherit from a Drupal core base theme?
We should first find out how other themes solve it!

Bootstrap 5 for example solves it like this: https://git.drupalcode.org/project/bootstrap5/-/blob/4.0.x/css/component...

But I think it would be better to inherit?

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes