What frameworks exists for UI documentation?

I´m working on a style guide which I want to put on the web with info, examples etc.

I know there is one API / framework called Fractal, but it does not have the look and feel I want. I see a lot of documentation following this pattern: https://semantic-ui.com/modules/sidebar.html#/settings and it has the look and feel I want.

Does anyone know what framework / API I can use?