Introduce  for hx and buttons

Change-Id: I1f85548b1e39de13ca6474c8d29d10f502e0ee9f
diff --git a/config.php.example b/config.php.example
index bd4cc3f..cef86ee 100755
--- a/config.php.example
+++ b/config.php.example
@@ -23,6 +23,7 @@
 $SERVICE_URL = "https://www.example.org";
 $SERVICE_LOGO = "./static/Test_Logo.svg";
 $SERVICE_NAME = "International Test Corpus";
+$SERVICE_COLOR = "#FF973A";
 
 $REGULAR_CONFERENCE_FEE = 280;
 $EARLYBIRD_CONFERENCE_FEE = 240;