On the music and songs news box, the inferior border is white instead of green.

That looks like a feature, not a bug.

It makes the different kinds of news look different.

It's fun that you say "looks like a feature"
Maybe it could be another color? It looks horrible the way it is :P

It looks good to me...

I guess it's a matter of opinions :P

Or lazyness. You're free to update the stylesheet...

You can only do that if you have more than one message ;-)

It's a bug known since long time ago, but I've never cared enough to fix it.