Investigate whether media, media-body, and media-section classes are needed for the MR widgets

The following discussion from !100486 (merged) should be addressed:

• @dftian started a discussion: (+1 comment)

  The source of these button alignment bugs is the media, media-body, and media-section classes. I think the intention is to have the contents go from a horizontal layout to a vertical layout when the page width gets narrow (i.e. mobile view), but for the MR widgets we don't want that, and want to keep the same layout at all page widths so that the buttons aren't positioned strangely.

  I think that the proper solution is to remove the media classes, but I don't enough about them to be comfortable doing that without understanding what else that would affect, so for now I've added classes to fix the immediate issue.