Eli Zaretskii <eliz@gnu.org> writes:

>> I just made a tweak to the way 3D boxes are drawn, to make them more
>> legible.
>
> Can you tell more?  What should be the differences as result of this
> change?  Perhaps screen snapshots will be useful.

Here is a before/after image of a button.  The outermost line of the top
and left surface of the button is drawn using the black relief, so that
it is visible on bright backgrounds.