Works like a charm! Thanks for that!
Some other things:
1.
I have added further CSS I found in the support forum, now the logo left of the site title is too close to the site title.
Is there a fix for that?
2.
Another problem appears on mobile screens (eg. Apple iPhone 6S). There is white space above the header which moves out of sight when scrolling the site.
Regards,
Jürgen