[pitivi] ui: Tweak Video clips Background

[Alexandru Băluț <alexbalut src gnome org>]

commit da3657a704c29de8d6a66ec626fcb74bd1276b13
Author: Diego Garcia Gangl <dnicolas gmail com>
Date:   Sun May 12 20:41:57 2019 -0300

    ui: Tweak Video clips Background
    
    Increase contrast and make the CSS color use the same format as the other clips.

 pitivi/utils/ui.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/pitivi/utils/ui.py b/pitivi/utils/ui.py
index 0159687e..4b683e07 100644
--- a/pitivi/utils/ui.py
+++ b/pitivi/utils/ui.py
@@ -176,7 +176,7 @@ EDITOR_PERSPECTIVE_CSS = """
     }
 
     .VideoBackground {
-        background-color: #2d2d2d;
+        background-color: rgb(25, 25, 25);
     }
 
     .AudioBackground:selected {
@@ -184,7 +184,7 @@ EDITOR_PERSPECTIVE_CSS = """
     }
 
     .VideoBackground:selected {
-        background-color: #0f0f0f;
+        background-color: rgb(5, 5, 5);
     }
 
     .TitleClip .VideoBackground {