[gnome-nibbles] Fix number of players button pseudo-class

[Iulian Radu <iulianradu src gnome org>]

commit d85f98d72c3cb892cb981b4426a93286d0b5ba4b
Author: Iulian Radu <iulian radu67 gmail com>
Date:   Sat Feb 13 19:08:27 2016 +0200

    Fix number of players button pseudo-class

 data/nibbles.css |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/nibbles.css b/data/nibbles.css
index 7b33f03..7df6ee1 100644
--- a/data/nibbles.css
+++ b/data/nibbles.css
@@ -20,7 +20,7 @@
 .number-box:hover {
   background-image: linear-gradient(to bottom, rgba(60, 69, 71, 0.8));
 }
-.number-box:focus {
+.number-box:checked {
   background-image: linear-gradient(to bottom, #215d9c);
 }
 .number-box-focus:hover {