Google Sites iframe problem

Hey, first of all sorry if I’ve created this topic in a wrong category.

I own a Google Site (sites.google.com/) and want to place advertisement of epicgameads, gtburst, cpmstar… not Google adsense but when I add the code using “embed gadget” Opera says: “Opera has blocked content on this page that comes from insecure sources”. but I’ve seen ads on other Google Sites…

I’ve also tried iframe but the same result…

Anybody can help me?

Thanks in advance.

Can you make sure all the content is from httpS://…

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