On Lesson content pages, users may enter long strings in content description fields. These render as single-line input buttons that run off the right edge of the page.

To reproduce:
1. Create a Lesson
2. Add a content page
3. Enter some text (long) into the Content 1 description field
4. Save the page and preview it

Tested with base, standard, and clean themes. The clean theme does at least provide a horizontal scrollbar, but it's still not very pretty.