Add background to disclaimers

osu.Game/Screens/Play/PlayerLoaderDisclaimer.cs

@@ -24,12 +24,26 @@ public PlayerLoaderDisclaimer(LocalisableString title, LocalisableString content
         }
 
         [BackgroundDependencyLoader]
-        private void load(OsuColour colours)
+        private void load(OsuColour colours, OverlayColourProvider colourProvider)
         {
-            Width = SettingsToolboxGroup.CONTAINER_WIDTH;
+            RelativeSizeAxes = Axes.X;
             AutoSizeAxes = Axes.Y;
+            Masking = true;
+            CornerRadius = 5;
 
             InternalChildren = new Drawable[]
+            {
+                new Box
+                {
+                    RelativeSizeAxes = Axes.Both,
+                    Colour = colourProvider.Background4,
+                },
+                new Container
+                {
+                    RelativeSizeAxes = Axes.X,
+                    AutoSizeAxes = Axes.Y,
+                    Padding = new MarginPadding(10),
+                    Children = new Drawable[]
                     {
                         new Circle
                         {
@@ -61,6 +75,8 @@ private void load(OsuColour colours)
                                 }
                             }
                         }
+                    }
+                }
             };
         }
     }