[gnome-panel/wip-tasklist: 3/4] Yaru: add rgba gradient and remove background

[Sebastian Geiger <segeiger src gnome org>]

commit 19df1ae02617b52ef8d97f4237a51a8876a91a01
Author: Sebastian Geiger <sbastig gmx net>
Date:   Sat Feb 29 17:27:39 2020 +0100

    Yaru: add rgba gradient and remove background

 data/theme/Yaru/gnome-panel.css | 8 ++++++++
 1 file changed, 8 insertions(+)
---
diff --git a/data/theme/Yaru/gnome-panel.css b/data/theme/Yaru/gnome-panel.css
index 22cb14041..0814cfec6 100644
--- a/data/theme/Yaru/gnome-panel.css
+++ b/data/theme/Yaru/gnome-panel.css
@@ -3,3 +3,11 @@
 wnck-pager:selected {
   background-color: @theme_selected_bg_color;
 }
+
+#tasklist-button {
+  background-image: none;
+}
+
+#tasklist-button > box {
+  background-image: linear-gradient(to top, rgba(252,252,252,.6) 3px, rgba(252,252,252,.8));
+}