Mobile problems with my theme Vierra

So http://1466.customer.net-spacy.com/news/unser-newsletter/ - once again. I need a way to NOT show the flipbook on mobile browsers (incl. ipad) as it looks like crap :wink:

Trying

@media only screen and (max-device-width: 1080px) {
#bookContainer.bookStage {
display: none;
}
}

with and without !important, with and without #bookContainer did not work on my iPhone 6plus - it was still showing.

Then there is the footer that looks not so nice - and the header, which is too big but does NOT contain the language switcher as it should (all on mobiles)