[gnome-usage/tracker-powered-storage-view-wip] css: Fix background color for stack-children

[Felipe Borges <felipeborges src gnome org>]

commit 1589531308803e1c357d0f34404c66cfb3b83801
Author: Petr Štětka <pstetka redhat com>
Date:   Tue Jun 12 14:29:15 2018 +0200

    css: Fix background color for stack-children

 data/interface/adwaita.css | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/data/interface/adwaita.css b/data/interface/adwaita.css
index ffcee6d..105a46e 100644
--- a/data/interface/adwaita.css
+++ b/data/interface/adwaita.css
@@ -186,7 +186,7 @@ ColorRectangle.available-storage, StorageGraph.available-storage {
     border-bottom: 1px solid @borders;    
 }
 
-.stack-children { background: #fafafa; } /* FIXME: Doesn't work with other themes. */
+.stack-children { background: alpha(@theme_fg_color, 0.07); }
 
 box.storage {
     background-color: #ffffff;