Your suggentions are good, thank You. I just wish, I could position the 360 view right under the gallery with the same margin, as the gallery images have to one another. You are right, I would have to make it smaller, exactly as wide as the gallery section to be precise. That is fine with me.
If I do that now but have a longer product description, the 360 view will wander down below the last line of the content and not stay at the position after the gallery. Can that be sloved via CSS ?