[fractal/fractal-next] content: Fix room-history background style

[Julian Sparber <jsparber src gnome org>]

commit 8fdf61d466b4968e66cbe83bf373ffc2baec2f96
Author: giusdp <depalma gsp gmail com>
Date:   Thu Jun 17 15:00:02 2021 +0200

    content: Fix room-history background style
    
    fix: https://gitlab.gnome.org/GNOME/fractal/-/issues/777

 data/resources/style.css | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/data/resources/style.css b/data/resources/style.css
index 4b64ba80..62cbe1b9 100644
--- a/data/resources/style.css
+++ b/data/resources/style.css
@@ -89,6 +89,10 @@ headerbar.flat {
 }
 
 /* Content */
+.room-history {
+  background: @theme_base_color;
+}
+
 .room-history row {
   min-height: 0;
   padding-top: 6px;