mhm.
it looks like i can’t edit my old answers.
so here’s the link with the iFrame on a page as well as in the widget:
Link
Hi @aahulsebos
sorry, I’ve forgotten to add this info.
I’m using a default HTML-Widget. With a (for me) normal iframe.
Thanks.
mybad.
there was some other add-on which also had a spoiler-code, which i didn’t see.
the styles were mixed up.
it’s now fixed and working!
sorry for bothering you & thanks for your help!