Orchis is a flat style gtk theme for Gnome/Gtk desktop. It is provided generally from gnome-look.org: https://www.gnome-look.org/p/1357889.
To use this theme:
For a brief period, you will need to manually connect this theme to each snap after the above steps, in order to tell the snapped app which theme to use. For example, to connect
gnome-calculator to this theme:
$ sudo snap connect gnome-calculator:gtk-3-themes gtk-theme-orchis:gtk-3-themes
Choose your Linux distribution to get detailed installation instructions. If yours is not shown, get more details on the installing snapd documentation.
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