How to show popup using a custom class

I have created a new popup using popup builder and want to replace the existing popup (made using another plugin) with the new popup. The old popup was displayed using class "page-cta". Now I want to set the new popup so that it also get displayed using the same class used for the old popup. How can I achieve this:


Note: I can't use the ID provided by the bebuilder's popup, because then I will need to add this ID to more than 1000 buttons embedded across the whole website.

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