Adding fat border to be able to recognize selected tile

config.h

@@ -1,7 +1,7 @@
 /* See LICENSE file for copyright and license details. */
 
 /* appearance */
-static const unsigned int borderpx  = 1;        /* border pixel of windows */
+static const unsigned int borderpx  = 5;        /* border pixel of windows */
 static const unsigned int snap      = 32;       /* snap pixel */
 static const int showbar            = 1;        /* 0 means no bar */
 static const int topbar             = 1;        /* 0 means bottom bar */