Index: src/wp-includes/css/jquery-ui-dialog.css
===================================================================
--- src/wp-includes/css/jquery-ui-dialog.css	(revision 45286)
+++ src/wp-includes/css/jquery-ui-dialog.css	(working copy)
@@ -182,7 +182,7 @@
 	display: inline-block;
 	text-decoration: none;
 	font-size: 13px;
-	line-height: 26px;
+	line-height: 2;
 	height: 28px;
 	margin: 0;
 	padding: 0 10px 1px;
@@ -272,7 +272,7 @@
 	height: 36px;
 	font-size: 18px;
 	font-weight: 600;
-	line-height: 36px;
+	line-height: 2;
 	padding: 0 36px 0 16px;
 }
 
@@ -298,7 +298,7 @@
 	speak: none;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
-	line-height: 36px;
+	line-height: 1.8;
 	width: 36px;
 	height: 36px;
 	content: "\f158";