[gnome-games/wip/exalm/css: 2/3] ui: Use 'backdround' class, drop 'solid-background'

[Alexander Mikhaylenko <alexm src gnome org>]

commit 617d48153ef8723215f269a0cf1de9c1f1091965
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Wed Jan 15 21:57:46 2020 +0500

    ui: Use 'backdround' class, drop 'solid-background'

 data/gtk-style.css         | 8 --------
 data/ui/collection-box.ui  | 2 +-
 data/ui/savestates-list.ui | 2 +-
 3 files changed, 2 insertions(+), 10 deletions(-)
---
diff --git a/data/gtk-style.css b/data/gtk-style.css
index 9add21dc..1e921be6 100644
--- a/data/gtk-style.css
+++ b/data/gtk-style.css
@@ -1,13 +1,5 @@
 /* This file is part of GNOME Games. License: GPL-3.0+. */
 
-.solid-background {
-       background-color: @theme_bg_color;
-}
-
-.solid-background:backdrop {
-       background-color: @theme_unfocused_bg_color;
-}
-
 .savestate-row {
        padding: 0;
 }
diff --git a/data/ui/collection-box.ui b/data/ui/collection-box.ui
index 65560069..b5f5a054 100644
--- a/data/ui/collection-box.ui
+++ b/data/ui/collection-box.ui
@@ -28,7 +28,7 @@
             <property name="transition-type">crossfade</property>
             <signal name="notify::visible-child" handler="on_visible_child_changed"/>
             <style>
-              <class name="solid-background"/>
+              <class name="background"/>
             </style>
             <child>
               <object class="GamesEmptyCollection" id="empty_collection">
diff --git a/data/ui/savestates-list.ui b/data/ui/savestates-list.ui
index 71f93aab..f8593768 100644
--- a/data/ui/savestates-list.ui
+++ b/data/ui/savestates-list.ui
@@ -3,7 +3,7 @@
   <requires lib="gtk+" version="3.24"/>
   <template class="GamesSavestatesList" parent="GtkBox">
     <style>
-      <class name="solid-background"/>
+      <class name="background"/>
     </style>
     <child>
       <object class="GtkRevealer" id="revealer">