Oh gotcha! You can drop something like this in your website:
<iframe width="1024" height="768" src="http://www.bbc.com" style="-webkit-transform:scale(0.5);-moz-transform-scale(0.5);"></iframe>
Replace http://www.bbc.com with a site link that you want to show. If you’re trying to do it with webflow subdomains it won’t let you for security reasons. Though you can add this code to an embed element inside webflow if you want to show a different website.