The 'action' fieldset that we use to contain our action buttons at the end of a form now feels distinct from the form itself.. the combined margin and padding of the two fieldsets one above the over leads to a lot of 'greyspace' between the 'box' of the form input section and the buttons in the action fieldset.
Created attachment 142314 [details] Example
Created attachment 142710 [details] [review] Bug 31904: Remove padding-top from fieldset.action
Like that? https://snipboard.io/cdBfhJ.jpg
A fix for this is part of Bug 32022 *** This bug has been marked as a duplicate of bug 32022 ***