[Cin] Cakewalk theme

[Phyllis Smith]

Andrea - good suggestion:

>  If I can make a small request based on my taste: put a small frame to
>
the plugins to distinguish the various bars and not have a homogeneous
> mass as you see in the image:
>
> https://i.postimg.cc/WbyrP2Q6/blend-plugins.jpg
>
> Olaf supplied your requested change and it looks good. It will happily go
into the builds tomorrow.  As I have finally learned, we should use png
instead of jpg for better quality pictures as long as upload is not a
problem.
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