Hi @Helli ,
Sorry, I will not be able to give you a ready-to-go solution for you as this extends the functionalities of Buttonizer. But I can give you a direction of what I think you will have to do:
You will have to style the iframe and the other elements using css to get it on top (give it an higher z-index). So perhaps you could add some of the following custom css (go to the buttonizer custom styling editor!):
.iframe-overlay, .iframe-container {
z-index: 9999999 !important;
}
If this doesn't work you could perhaps look to the place or person where you got the HTML from and ask for support there.