From bc9ccf5490c9d7f5cb35874698523c0d0481a5d0 Mon Sep 17 00:00:00 2001
From: Vincent Langlois
+ You can add the class default
to any button to apply additional styling,
+ useful when communicating to the user what default action would happen in the active window if
+ the Enter key was pressed on Windows 98.
+
When buttons are clicked, the raised borders become sunken. The following button is simulated to be in the pressed (active) state.