[pitivi] ui: Separate timeline backgrounds

[Alexandru Băluț <alexbalut src gnome org>]

commit 9983ec6086a18ecfec7451b38a5bce74fcf1dac6
Author: Diego Garcia Gangl <dnicolas gmail com>
Date:   Fri Apr 26 20:53:52 2019 -0300

    ui: Separate timeline backgrounds

 pitivi/utils/ui.py | 10 ++++++++++
 1 file changed, 10 insertions(+)
---
diff --git a/pitivi/utils/ui.py b/pitivi/utils/ui.py
index 1176a70d..d631a39f 100644
--- a/pitivi/utils/ui.py
+++ b/pitivi/utils/ui.py
@@ -208,6 +208,16 @@ EDITOR_PERSPECTIVE_CSS = """
         background-image: url('%(trimbar_focused)s');
     }
 
+    /* Background inside the timeline */
+    .Timeline {
+        background: shade(@theme_bg_color, 0.75);
+    }
+
+    /* Background in the layers list */
+    .Timeline viewport {
+        background: @theme_bg_color;
+    }
+
     .Clip {
     }