The undershoot rendering in the gtk-demo sidebar was inheriting unwanted background. Prevent that.
b1e7106 Adwaita: Fix sidebar undershoot
gtk/theme/Adwaita/_common.scss | 4 +
gtk/theme/Adwaita/gtk-contained-dark.css | 207 +++++++++--------------------
gtk/theme/Adwaita/gtk-contained.css | 211 ++++++++++--------------------
3 files changed, 135 insertions(+), 287 deletions(-)
Upstream: git.gnome.org