I already sent this answer 3 weeks ago, but didn't got an answer. So ... I try again
The site is: www.aesthetx.de
There is a Background colour in some Browsers. It fills the hole site, not only body or header.
here is like it should be (Safari): https://acrobat.adobe.com/link/track?uri=urn:aaid:scds:US:32b065dd-2697-324b-940a-53b5d89aac12
and this is what it looks like in Firefox, Chrome: https://acrobat.adobe.com/link/track?uri=urn:aaid:scds:US:33ad11da-c713-34b5-8a92-b17ef83f7b33
