In Steve’s session he had a list of CSS classes, some build in. He had handy lists in his snippets, but where can I find such things. I have looked at the documentation pages on getuikit.com but cannot find anything.
you can find built-in classes on the uikit docs, for example the flex classes are all listed and explained here: https://getuikit.com/docs/flex
Also I’ve included many examples and variations on the Tests projects given with the package, you can copy&paste into your own projects. Here’re examples for the Flex stack: https://uikitstacks.com/projects/tests/flex/