Make a different color or font for chapter introductions

[LAfricain]

Is your feature request related to a problem? Please describe.
For the moment, chapter introductions (<div type="introduction">), when modules have them, are in the same font and color as the Bible text itself. This initially makes it impossible to differentiate them from the Bible text itself.

Describe the solution you'd like
It might be useful to display it in a different colour, or in italic, or in a different font, to quickly realize that it's not biblical.