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I ran some tests but could not find a final working solution. I will continue and be back to you later.
Let us know if further support is needed.
Thank you. As an alternative I am using subtext.
Sorry for getting back to you only now. I tried to make the z-index to work with the iFrame and the Embed code options with no success.
Only with the Source Code embedding option I got results. You can test it here:
The downside is that the website code gets messy and it might create conflicts with the website's scripts. But it is necessary to test in order to see this.
Let us know if difficulties arise from this solution.