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Is it possible to place seachable text and buttons on images like below with Revindex Block
I'm not sure what do you mean by searchable text and buttons? Do you have an example? The text you create using Block are searchable by DNN site crawler.
To create a button with an icon.
If you're looking for a search text and button, in the Call to actions section, you should be able to find an example that is close enough to what you need and just modify from there.