This issue is best illustrated with an image:

Screen shot of pavucontrol with the grey borders around the application content

As you can see above there is a grey border around the actual contents of the application.

What I've tried thus far is to modify the contents of .config/gtk-3.0/gtk.css according to the pointers given on a probably unrelated bug on CSD.

I've tried to select the area around the contents with gtk-inspector but to no avail.

Trying to target the grey area with gtk-inspector.

Neither does applying, as seen above, a style removing margins, padding and borders to the background-class associated with the upper-most gtk element have any effect.

Having no experience at all with gtk development I'm unsure where to go from here.

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closed as off-topic by Pilot6, Byte Commander, Parto, xangua, Eric Carvalho Apr 1 '16 at 0:20

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Bug reports and problems specific to development version of Ubuntu should be reported on Launchpad so that developers can see, track and fix these issues." – Pilot6, Byte Commander, Parto, xangua, Eric Carvalho
If this question can be reworded to fit the rules in the help center, please edit the question.

    
Questions about bugs and about future releases are off-topic here, because they should be posted as bug report on Launchpad against the respective package, so that the developers can quickly fix it. – Byte Commander Mar 31 '16 at 9:26
    
Well, it's not necessarily a bug as much as it is a question of taste and themes. Perhaps my wording was off. But then are all questions about 16.04 off topic until its release? – Rovanion Mar 31 '16 at 10:17
2  
I ended up filing a bug report on launchpad either way: bugs.launchpad.net/ubuntu/+source/pavucontrol/+bug/1564349 – Rovanion Mar 31 '16 at 10:32
    
Ford_Prefect in #pulseaudio@irc.freenode.net has submitted a patch for this bug: lists.freedesktop.org/archives/pulseaudio-discuss/2016-March‌​/… – Rovanion Mar 31 '16 at 14:31
up vote 2 down vote accepted

It turns out that this was a bug in pavucontrol which should be fixed with a future release: https://lists.freedesktop.org/archives/pulseaudio-discuss/2016-March/025937.html

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Nice that you found a solution. Don't forget to accept your own answer after the delay (2 days from asking the question) is over. – Byte Commander Mar 31 '16 at 18:55
    
Cheers @ByteCommander! – Rovanion Apr 1 '16 at 10:15

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