Best practice for UI elements

Hi all, I am building an extension that needs to have some inputs from the user; a couple text boxes, a few checkboxes. Is there a best practice / preferred UI framework to skin those UI elements?

I have gone from the lumino/ui-components and I could not see anything related to forms per se.
For reference, my extensions is at

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I’ve decided to embed an IFrame and reuse my existing UI + message passing for result. This thread can be closed.