Index: wp-includes/css/buttons.css
===================================================================
--- wp-includes/css/buttons.css	(revision 22289)
+++ wp-includes/css/buttons.css	(working copy)
@@ -42,9 +42,10 @@
 	vertical-align: middle;
 	text-decoration: none;
 	font-size: 12px;
-	line-height: 1.45em;
+	line-height: 23px;
+	height: 24px;
 	margin: 0;
-	padding: 3px 10px;
+	padding: 0 10px;
 	cursor: pointer;
 	border-width: 1px;
 	border-style: solid;
@@ -67,12 +68,16 @@
 
 .button.button-large,
 .button-group.button-large .button {
-	padding: 5px 12px;
+	height: 29px;
+	line-height: 28px;
+	padding: 0 12px;
 }
 
 .button.button-small,
 .button-group.button-small .button {
-	padding: 2px 8px;
+	height: 21px;
+	line-height: 20px;
+	padding: 0 8px;
 }
 
 .button:active {