[libdazzle] theme: adjust edge styling for tabs in Arc

[Christian Hergert <chergert src gnome org>]

commit f0387edb7ac61f536098136e6215d3c8efe29c96
Author: Christian Hergert <chergert redhat com>
Date:   Tue Jun 6 15:55:33 2017 -0700

    theme: adjust edge styling for tabs in Arc

 data/themes/Arc/Arc-panels.css |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/data/themes/Arc/Arc-panels.css b/data/themes/Arc/Arc-panels.css
index 68eb297..1c7699f 100644
--- a/data/themes/Arc/Arc-panels.css
+++ b/data/themes/Arc/Arc-panels.css
@@ -29,3 +29,11 @@ dzldockstack dzltabstrip dzltab:checked {
   border-top-width: 1px;
   border-bottom-width: 0px;
 }
+
+dzldockstack dzltabstrip dzltab:checked:first-child {
+  border-left-color: alpha(@theme_base_color, 0.25);
+}
+
+dzldockstack dzltabstrip dzltab:checked:last-child {
+  border-right-color: alpha(@theme_base_color, 0.25);
+}