How do I turn on dark mode in Gmail? The white inbox is blinding me at night.

On the phone app: tap the menu (three lines) > Settings > General settings > Theme > choose Dark. On desktop: click the gear (Settings) top-right > See all settings > Themes > pick the dark theme. On Android, setting Theme to 'System default' makes Gmail follow your phone's dark mode automatically, and iPhone does the same when set to System.

On mobile, 'System default' is the cleanest, Gmail flips to dark whenever your phone does, on schedule or at sunset. No manual toggling.

Desktop dark theme lives under Settings > Themes, near the bottom of the picker. It's a proper dark grey, easy on the eyes for late-night inbox zero.