Show floating panel on top of a Flextable?

I have a Flextable which occupies a fixed area in my app.

Now there are buttons outside this table which do certain actions.

I need to create a 'modal' sort of panel (transparent would be added bonus) which will cover this flex table or at least a part of it and show some text messages while the work triggered by a button click is being done.

I have searched a lot but there is no example or explanation about showing a floating modal or non modal div over a flext table.

Please help.

Thank you,

Sunit Katkar

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