[gnome-calendar] theme: fine tune line color

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

commit 41fb5c83d6ae8d04609bcc498a16edab50669060
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Sun Nov 19 13:34:23 2017 -0200

    theme: fine tune line color

 data/theme/gtk-styles.css |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/theme/gtk-styles.css b/data/theme/gtk-styles.css
index 4cecb1e..ac46f86 100644
--- a/data/theme/gtk-styles.css
+++ b/data/theme/gtk-styles.css
@@ -421,7 +421,7 @@ weekgrid:selected,
  */
 
 monthcell {
-       border: solid 1px @borders;
+       border: solid 1px alpha(@borders, 0.3);
        border-width: 1px 0 0 1px;
        background: transparent;
        padding: 1px 0 1px 0;