Thank you so much, I did manage to get this far, the only trouble was that it didnt seem responsive. The window height will not change when the window becomes smaller, since its pre-defined by the iframe. Any way to avoid that?
thank you so much for helping! However Im getting an unexpected result. Could I have some settings wrong? Would you be willing to look at my page? I kept your code as-is for testing, inserting my own images. No image pops up, neither does the close button, and the tiny part of the modal showing is on the top left instead of centered. When I check the code it seems the image IS in there but not sure whats happening.