I'm in process of finishing my dissertation. I would like to have a separation between proof/equations (upper) and its explanation (under) so that the readers can easily notice. So far I have used a simple line to separate like this:
![enter image description here][1]

Because this is a scientific paper, I don't want to overdecorate it, just clean and neat. I don't think it is a good idea to have wingdings characters. I use Word.

If you have any ideas about it, please share. Thank you so much.
  [1]: https://i.sstatic.net/iwGdk.png