Attempt at fixing the jumbled styling of the search form in Apple’s Safari, which is not present in Blink browsers like Opera, or Chrome:
It appears I forgot about that one in my PR some months back which addressed how forms in Safari were displayed (maybe search wasn’t even there then...?).
Safari does seem a bit like the new Internet Explorer these days, unfortunately.
This is otherwise a rather small and safe PR for merging, since it has practically no reason to break anything anywhere else.