Change to ‘dark mode’ on GitHub

For instance, GitHub pages may be in dark mode when logged out and not when logged in.

Sample GitHub page

Change to dark mode

When logged in, click on the profile picture in the upper right → Settings → Appearance (in the left panel). Set Theme mode to “Single theme”. Select “Dark high contrast”.

When logged out, click on the “Appearance settings” icon in the upper right. Enable “Dark mode” (the last item). Though it may not actually change to dark mode…

Bonus: Change to dark mode in LibreOffice

Menu Tools → Options (shortcut Alt + F12) → Application Colors (left panel, in “LibreOffice”) → Document background. Also change “Font color”, for example, to orange.

Though it will only change the spreadsheet itself, not the menus, toolsbars, status area at the bottom, etc.

To refine it, use the colours from well-known colour schemes, e.g, Solarized. For Solarized, the default is base0, base03 (foreground colour, background colour), where base0 is RGB 839496 and base03 is RGB 002B36.

These can be entered in “Custom Color”, under “RGB”, in the “Hex #” field:

• Document background: 002B36
• Font color: 839496
• In section “Spreadsheet” (4th section), Grid lines: ‘Light Blue 2’ (729FCF)

Also zoom: Menu View → Zoom → 200%

See also:

• Dracula theme for LibreOffice (referenced here)

Bonus: Change to dark mode on Wikipedia

When logged in, open Preferences → section “Appearance” (about 20% down) → Color. Set it to “Dark”.

Note: This doesn’t work for the “Vector legacy (2010)” theme. In the same section, change to the “Vector (2022)” theme.

When logged out: JavaScript must be allowed from wikipedia.org (e.g., in NoScript). In the “Appearance” panel on the right, choose “Dark” in section “Color (beta)” (the third section). In subsequent sessions, that JavaScript must be allowed for it to work.

See also:

• Wikipedia:Dark mode

Bonus: Change to dark mode in gitk (a Git repository browser)

Menu “Edit” → “Preferences” → “Edit” → tab “Colors”. Then use buttons “Background” and “Foreground”.

For example, Solarized:

• “Background”: 002B36 = decimal 00, 43, 54.
• “Foreground”: 839496 = decimal 131, 148, 150.

It isn’t possible to enter the numbers directly. The fields appear to editable, but they are not. The only way is using the sliders (or click in the colour bars).

Extra: Increase the font size (of the main list): Menu Edit → Preferences → tab Fonts → Main font: Set “Size” to, for example, 12.

Bonus: Change to dark mode in Meld (a diff tool)

Menu “Meld” → “Preferences” → “Edit” → tab “Editor” (the default) → “Syntax highlighting color scheme”. Set it to, for example, “Solarized Dark”.

Though “Cobalt” is easier to read (high contrast).

Extra: Increase the font size: Menu “Meld” → “Preferences” → “Edit” → tab “Editor” (the default). And:

1. Uncheck “Use the system fixed width font”.
2. “Editor font”: Change the size to, for example, 18.