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.shell-link, .lowres-icon and .icon-dropshadow could be used globally. For the icon shadow classes, they're used by officially supported extensions.[1] [1] https://gitlab.gnome.org/GNOME/gnome-shell-extensions/issues/168 https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/938
GNOME Shell Sass
GNOME Shell Sass is a project intended to allow the sharing of the theme sources in sass between gnome-shell and other projects like gnome-shell-extensions.
Any changes should be done in the GNOME Shell subtree and not the stand-alone gnome-shell-sass repository. They will then be synchronized periodically before releases.
License
GNOME Shell Sass is distributed under the terms of the GNU General Public License, version 2 or later. See the COPYING file for details.