[gnome-control-center/gbsneto/minor-cleanups-pt1: 4/10] sound: Add boxed list around system volume

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit aadf010e94096f9886db155fb46c544eeb48335d
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Fri Jan 21 12:14:20 2022 -0300

    sound: Add boxed list around system volume
    
    See https://gitlab.gnome.org/GNOME/gnome-control-center/-/issues/1587

 panels/sound/cc-sound-panel.ui | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)
---
diff --git a/panels/sound/cc-sound-panel.ui b/panels/sound/cc-sound-panel.ui
index e20071b08..dadf96a40 100644
--- a/panels/sound/cc-sound-panel.ui
+++ b/panels/sound/cc-sound-panel.ui
@@ -7,7 +7,16 @@
           <object class="AdwPreferencesGroup">
             <property name="title" translatable="yes">System Volume</property>
             <child>
-              <object class="CcVolumeSlider" id="output_volume_slider" />
+              <object class="AdwPreferencesRow">
+                <child>
+                  <object class="CcVolumeSlider" id="output_volume_slider">
+                    <property name="margin-top">12</property>
+                    <property name="margin-bottom">12</property>
+                    <property name="margin-start">12</property>
+                    <property name="margin-end">12</property>
+                  </object>
+                </child>
+              </object>
             </child>
           </object>
         </child>