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The modal is from the Bootstrap building blocks. I have adapted it, as good as it goes, to SD3.
You can stick any contents into the modal body. If it gets too long for the viewport, it will scroll. Only, to be able to edit the modal, you need to add a bit of top padding to the container with the ID 'longModal', otherwise you won't see the top of it in the programme. When done, just remove that extra padding again. I left the 150px padding in for you to see, but if left like that, the modal appears a bit too far down on the web page.
To create a component, select the container 'wrapper'.