geldspielautomaten2000

I had the same problem at https://bookofrakostenlosspielen.org/. There is iframe placed in this page. I haven’t found quick and simple solution, so I have used @media:
for iframe i used: height:100%;
for div block which is parent for iframe (<div id=”playContainer) i have used @media:

@media (min-width: 600px) {
     div#playContainer { height:600px; }
   }
@media (min-width: 300px) {
     div#playContainer { height:300px; }
   }

I have the same issue at my website , but with German Special characters not with Cyrillic symbols. Andrei, Have you solved your problem?