use lineheight instead of padding and height

core/css/apps.css

@@ -50,8 +50,8 @@
 #app-navigation li > a {
 	display: block;
 	width: 100%;
-	height: 44px;
-	padding: 12px;
+	line-height: 44px;
+	padding: 0 12px;
 	overflow: hidden;
 	-moz-box-sizing: border-box; box-sizing: border-box;
 	white-space: nowrap;