No, that did not do what I want. But every time I go into depth, I discover new possibilities with GeneratePress. So I get the result I want, when I create a block-element and hook it above the footer. (Great and comfortable idea: Block-Elements)
Now, of course, there is a new “problem”: how can I add a shadow to that new element at the bottom of the element? It is the block element with the social icons: https://honigwerk.de/unsere-produkte/