When improving a tag wiki edit on SFF, I noticed what looks like a design bug: the excerpt field and edit reasons don't have the same width, and more importantly, the excerpt is slightly hidden behind the "What is a tag wiki excerpt?" panel.
Steps to reproduce, suggest a tag wiki edit, select "Improve Edit" or "Reject and Edit" upon reviewing.
Reproduced on Firefox 66.0.3, Windows 7. and on Edge.
I'm not actually sure those are the same bugs, as on the second screenshot, the excerpt field and edit reason field are nicely aligned and there's no overlaying panel. Please split the two reports if needed.