Hi Ben, thank you so much for your quick reply.
In fact the website klimastammtisch-ahr.de is part of a multi-site network, so your advice to log in as super admin solved the problem.
The main site natur-hochwasser-schutz-ahr.de immediately showed the result of the additional css-code. I would guess that the changes I add as super-admin on the main site will show on the subsite after clearing the cache.
Cheers, Rudolf
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This reply was modified 1 year, 12 months ago by rudolfmay.