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Rollover preview of webflow site in iFrame refused

Is it possible to add certain URL’s to a “list with permitted websites” that can have access to a published webflow website.
When the user moves the mouse over a link in the page, I want to show a popup window which loads the page in link as preview. Currently it says:
"Refused to display ‘http://xyz’ in a frame because an ancestor violates the following Content Security Policy directive: "frame-ancestors ‘self’ https://* "

Ok, I try :- )
What I actually want to do is, to show a preview image of my published webflow site on another page. There is a link and on rollover the popup should show the content of the webflow page. But I get the following error message (see screenshot)

Page with link:
Link in right column HIGHLIGHTS BOX (see screenshot)

Is there a way to get through the content security policy?

Last but not least, the read only link to my webflow project:

thanx for your support