Brume & Brume Ardoise: light pastel themes inspired by Liquid Glass

Themes
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Brume & Brume Ardoise: light pastel themes inspired by Liquid Glass

Hi everyone,

I made two light, minimal themes for Mailspring, designed around Apple’s Liquid Glass language (macOS 26):

  • Brume: soft lavender chrome, periwinkle accent.
  • Brume Ardoise: the same theme with a slate sidebar and a coral accent, a nod to Darkside.

Both share the exact same rules: Ardoise only changes colors, so spacing and behavior are identical.

brume-et-ardoise
brume-et-ardoise1600×1916 260 KB

Highlights

  • Frosted glass only on floating layers (popovers, menus, search suggestions); content stays opaque.
  • Resizable sidebar up to 420pt, 32pt rows, right-aligned counters.
  • Rounded selection pills, subtle separators, message cards, a floating composer action bar.
  • Restyled recipient tokens, attachments, undo toast, snooze popover, switches, preferences.
  • Respects Reduce transparency, Reduce motion and Increase contrast; text meets WCAG AA.

Install

  1. Download brume.zip or brume-ardoise.zip from the latest release.
  2. Unzip, then Mailspring > Install Theme… and pick the folder.
  3. Quit and relaunch Mailspring (the preloaded composer window and the sidebar width only update after a restart).

Built and tested on macOS; it should work elsewhere, but the toolbar capsules are macOS-specific. Feedback and screenshots of rough edges are welcome!