Public bug reported:

Bug summary
-----------
In "gnome-control-center" (aka "Settings" application) there are two selectable 
Appearance Styles: "Default" and "Dark".

For most applications "Default" style acts as a "Light" style, as
opposite to the other selectable style: "Dark".

For instance "Settings" or "Papers" applications are shown with white
background when "Default" style is selected but with black background
when "Dark" style is selected. It's in fact that way for almost any
other applications.

But "Showtime" is shown with black background always. So no white
background is shown for "Default" style broken the applications
uniformity.

Workaround
----------
"gnome-control-center" ("Settings") only allow to select between "Default" and 
"Dark" styles but it's corresponding gsettings key (org.gnome.desktop.interface 
color-scheme) allow three values: "default", "prefer-dark" and "prefer-light". 
The assignation is:

"gnome-control-center Default" -> org.gnome.desktop.interface color-scheme -> 
default
"gnome-control-center Dark" -> org.gnome.desktop.interface color-scheme -> 
prefer-dark

So, there is no way to select org.gnome.desktop.interface color-scheme
prefer-light using "gnome-control-center". But if prefer-light is
manually set "Showtime" shows it's white background as expected.

Additional info
---------------
# lsb_release -rd
Description:    Ubuntu 25.10
Release:        25.10

# apt-cache policy showtime
showtime:
  Instalados: 49.0-1
  Candidato:  49.0-1
  Tabla de versión:
 *** 49.0-1 500
        500 http://ports.ubuntu.com/ubuntu-ports questing/universe arm64 
Packages
        100 /var/lib/dpkg/status

** Affects: showtime (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: gnome-control-center showtime

** Tags removed: gnome-contropl-center
** Tags added: gnome-control-center

** Description changed:

  Bug summary
  -----------
  In "gnome-control-center" (aka "Settings" application) there are two 
selectable Appearance Styles: "Default" and "Dark".
  
  For most applications "Default" style acts as a "Light" style, as
  opposite to the other selectable style: "Dark".
  
  For instance "Settings" or "Papers" applications are shown with white
  background when "Default" style is selected but with black background
  when "Dark" style is selected. It's in fact that way for almost any
  other applications.
  
  But "Showtime" is shown with black background always. So no white
  background is shown for "Default" style broken the applications
  uniformity.
  
- 
  Workaround
  ----------
  "gnome-control-center" ("Settings") only allow to select between "Default" 
and "Dark" styles but it's corresponding gsettings key 
(org.gnome.desktop.interface color-scheme) allow three values: "default", 
"prefer-dark" and "prefer-light". The assignation is:
  
- "gnome-contropl-center Default" -> org.gnome.desktop.interface color-scheme 
-> default
- "gnome-contropl-center Dark" -> org.gnome.desktop.interface color-scheme -> 
prefer-dark
+ "gnome-control-center Default" -> org.gnome.desktop.interface color-scheme -> 
default
+ "gnome-control-center Dark" -> org.gnome.desktop.interface color-scheme -> 
prefer-dark
  
  So, there is no way to select org.gnome.desktop.interface color-scheme
- prefer-light using "gnome-contropl-center". But if prefer-light is
+ prefer-light using "gnome-control-center". But if prefer-light is
  manually set "Showtime" shows it's white background as expected.
- 
  
  Additional info
  ---------------
  # lsb_release -rd
  Description:  Ubuntu 25.10
  Release:      25.10
  
  # apt-cache policy showtime
  showtime:
-   Instalados: 49.0-1
-   Candidato:  49.0-1
-   Tabla de versión:
-  *** 49.0-1 500
-         500 http://ports.ubuntu.com/ubuntu-ports questing/universe arm64 
Packages
-         100 /var/lib/dpkg/status
+   Instalados: 49.0-1
+   Candidato:  49.0-1
+   Tabla de versión:
+  *** 49.0-1 500
+         500 http://ports.ubuntu.com/ubuntu-ports questing/universe arm64 
Packages
+         100 /var/lib/dpkg/status

-- 
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https://bugs.launchpad.net/bugs/2134318

Title:
  [Ubuntu 25.10 Questing] Showtime application doesn't follow system
  appearance style

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