There is no ".message-list-clear-button .button" selector, but ".message-list-clear-button.button". To make it clear, this commit adds .button to .message-list-clear-button. https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/931
https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/904
- split _common.scss into widgets - improve _drawing functions - minify SVG assets https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/904