Index: src/wp-includes/functions.php
===================================================================
--- src/wp-includes/functions.php	(revision 45286)
+++ src/wp-includes/functions.php	(working copy)
@@ -3176,7 +3176,7 @@
 			display: inline-block;
 			text-decoration: none;
 			font-size: 13px;
-			line-height: 26px;
+			line-height: 2;
 			height: 28px;
 			margin: 0;
 			padding: 0 10px 1px;
@@ -3196,7 +3196,7 @@
 
 		.button.button-large {
 			height: 30px;
-			line-height: 28px;
+			line-height: 2.15384615;
 			padding: 0 12px 2px;
 		}