[gnome-mines] Fix blurred images issues (!4)

[Robert Roth <robertroth src gnome org>]

commit 72665e27aecdefa4c13ff10f467af8c384c1c589
Author: Robert Roth <robert roth off gmail com>
Date:   Fri Oct 12 10:24:47 2018 +0300

    Fix blurred images issues (!4)

 src/gnome-mines.css | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/src/gnome-mines.css b/src/gnome-mines.css
index b641ce6..a884f8f 100644
--- a/src/gnome-mines.css
+++ b/src/gnome-mines.css
@@ -33,9 +33,10 @@
   border-image:none;
   font-size:16px;
   font-weight: bold;
-  background-size: 60%;
+  background-size: 100%;
   background-position: 50%;
-  padding:0px;
+  padding:4px;
+  background-origin: content-box;
   background-repeat: no-repeat;
   box-shadow:none;
   border-width:2px;