[tbb-bugs] #31778 [Applications/Tor Browser]: Support default dark-theme for the Circuit Display UI

[Tor Bug Tracker & Wiki]

#31778: Support default dark-theme for the Circuit Display UI
-------------------------------------+-------------------------------------
     Reporter:  antonela             |      Owner:  tbb-team
         Type:  defect               |     Status:  assigned
     Priority:  Medium               |  Milestone:
    Component:  Applications/Tor     |    Version:
  Browser                            |   Keywords:  ff68-esr, tbb-9.0-must-
     Severity:  Normal               |  alpha, TorBrowserTeam201909, ux-
                                     |  team
Actual Points:                       |  Parent ID:
       Points:                       |   Reviewer:  antonela
      Sponsor:                       |
-------------------------------------+-------------------------------------
 Let's do the necessary small tweaks to support our UI for the default
 dark-theme:

 - Remove background
 - Use the light version of the Tor icon
 - Use a light grey at the circuit graph lines
 - `Guard` needs to have #D476FF
 - At the bottom area, remove the background. It is going to make the
 helper text visible.

 Attaching TB 9.0a6 screenshot

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31778>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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