Index: wp-content/themes/twentyeleven/style.css
===================================================================
--- wp-content/themes/twentyeleven/style.css	(revision 22203)
+++ wp-content/themes/twentyeleven/style.css	(working copy)
@@ -431,6 +431,9 @@
 sub {
 	top: .5ex;
 }
+small {
+	font-size: 85%;
+}
 
 /* Forms */
 input[type=text],
Index: wp-content/themes/twentytwelve/style.css
===================================================================
--- wp-content/themes/twentytwelve/style.css	(revision 22203)
+++ wp-content/themes/twentytwelve/style.css	(working copy)
@@ -151,6 +151,9 @@
 sub {
 	bottom: -0.25em;
 }
+small {
+	font-size: 85%;
+}
 img {
 	border: 0;
 	-ms-interpolation-mode: bicubic;