Fwd: set screen( not x 11 !) color in Tails 3.0 (Debian) per command line , hide / remove panel

[swjatoslaw gerus <milstar2 eml cc>]

Gentlemen

gnome-control-center is already the newest version (1:3.22.1-1).

 Tails 3.0 Tor 7   realease feb 2017

1.  screen(not  x11 !) background color

command line

root   ...gnome-control-centr  background  

Started  window with  Title "Background"   and color must be selected per mouse

   Developer forget  install black color  in  menu ( pink  yellow   .. present)

  How can  perform this task   ... from command line  ?

 ...gnome-control-centr  background  .... color= black or color="#000000"

   Relevant comment would appreciated

2.   a.hide panel   per command line

(small icon in top corner as in solaris 11.3)

 how perform that from command line ?

b. remove panel 

Relevant comment would appreciated

 

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