[V3] Make the Spinner works independently of a flex box

[iceleo-com]

It took me a while to realize the Spinner doesn't work unless it is wrapped in a flex box.

Check my Stackblitz for the problem: https://stackblitz.com/edit/vitejs-vite-djfzcswe?file=src%2FApp.tsx

If possible, hopefully you can update this component and make it work independently.