[@project_subdomain Participant 11 years, 1 month ago]

Thanks, @robkk!
This adds a vertical scrollbar only, same cut off width (have it at 320er query already).
Hugging all elements of the forms (tested via form-reply.php) with a new, then styled div, as the form-legend shall be also responsive, also does not work.
Just don’t find the reason, will have another look.