Index: wp-content/themes/twentyfifteen/style.css
===================================================================
--- wp-content/themes/twentyfifteen/style.css	(revision 55900)
+++ wp-content/themes/twentyfifteen/style.css	(working copy)
@@ -549,7 +549,6 @@
 	font-size: 1.2rem;
 	font-weight: 700;
 	padding: 0.7917em 1.5em;
-	text-transform: uppercase;
 }
 
 button:hover,