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
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Snaps are applications packaged with all their dependencies to run on all popular Linux distributions from a single build. They update automatically and roll back gracefully.
Snaps are discoverable and installable from the Snap Store, an app store with an audience of millions.
Snap can be installed on elementary OS from the command line. Open Terminal from the Applications launcher and type the following:
sudo apt update
sudo apt install snapd
Either log out and back in again, or restart your system, to ensure snap’s paths are updated correctly.
To install gtk-theme-orchis, simply use the following command:
sudo snap install gtk-theme-orchis
Browse and find snaps from the convenience of your desktop using the snap store snap.
Interested to find out more about snaps? Want to publish your own application? Visit snapcraft.io now.