Update CSS and button styles

Signed-off-by: Pascal Andy <pascal@firepress.org>

Author: pascalandy

assets/css_firepress/button-examples/btn_a.md

@@ -7,11 +7,11 @@
 
 @import "simplegrid.min.css";
 
+@import "btn_c.min.css";
+
 @import "btn_a_var.css";
 @import "btn_a.min.css";
 
-@import "btn_c.min.css";
-
 /*  ==========================================================================
 bypassed
 

assets/css_firepress/button-examples/btn_b.md

@@ -0,0 +1,9 @@
+## See it live
+
+On https://play-with-ghost.com/ check out our live demos. Then find a the page label as "Style guide" in each live demos.
+
+## Markdown style guide sources
+
+You will find how to integrate buttons here:
+
+https://gist.github.com/pascalandy/88220587af37ae455c53a56564ce4969