--- a/wp-admin/css/admin-menu.css
+++ b/wp-admin/css/admin-menu.css
@@ -234,6 +234,8 @@
 
 #adminmenu a.menu-top,
 #adminmenu .wp-submenu-head {
+	box-sizing: border-box;
+	height: 34px;
 	font-size: 14px;
 	font-weight: 400;
 	line-height: 1.3;
@@ -317,8 +319,8 @@
 
 .folded #adminmenu div.wp-menu-image {
-	width: 35px;
-	height: 30px;
+	width: 36px;
+	height: 34px;
 	position: absolute;
 	z-index: 25;
 }