There are no shadows on text displayed within the written and writable book interfaces

The Bug:

There are no shadows on text displayed within the written and writable book interfaces.

The report was created based on this comment by [Mojang] slicedlime.

Steps to Reproduce:

1. Obtain a book and quill and open it.
2. Look closely at the text displayed within the interface.

Observed Behavior:

There are no shadows.

Expected Behavior:

There would be shadows.