#### Why are we doing this?
Android 10 newly introduced a new system setting called “Dark theme”, which allows users to toggle a system wide dark appearance.
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In the Wikipedia app, users currently have to manually adapt their (reading) theme setting based on their system setting.
#### Suggested solution
Enhance the “App theme” setting and bottom sheet in articles with a **Match system theme** toggle.
| Match system theme **on** (System dark theme off) | Match systeme theme **off** (System dark theme on) | Match system theme **off**
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If users have set “Match system theme” to **on** (active toggle), they are able to choose which theme they’d like to use for the two states, see table below.
| | System dark theme Off | System dark theme On
| “Match system theme” Off | Light, Sepia, Dark, Black | Light, Sepia, Dark, Black |
| “Match system theme” On | Light, Sepia | Dark, Black |
Some additional conditions:
- The app’s “Match system theme” setting is off by default.
- If the app’s “Match system theme” setting is enabled and the system’s dark theme setting is off, the app defaults to light theme.
- If the app’s “Match system theme” is enabled and the system’s dark theme setting is on, the app defaults to use the black theme.
- If the “Match system theme” setting is enabled, theme options that are not available are in disabled state (greyed out/reduced opacity).
- The app remembers if users change their preferred themes.