Index: src/wp-admin/css/admin-menu.css
===================================================================
--- src/wp-admin/css/admin-menu.css	(revision 27236)
+++ src/wp-admin/css/admin-menu.css	(working copy)
@@ -332,7 +332,7 @@
 }
 
 #adminmenu .wp-menu-image img {
-	padding: 9px 0 0 0px;
+	padding: 9px 0 0 0;
 	opacity: 0.6;
 	filter: alpha(opacity=60);
 }
@@ -344,7 +344,7 @@
 #adminmenu div.wp-menu-image {
 	float: left;
 	width: 36px;
-	height: 30px;
+	height: 34px;
 	margin: 0;
 	text-align: center;
 }
@@ -357,11 +357,11 @@
 }
 
 div.wp-menu-image:before {
-	font: normal 20px/1 'dashicons' !important;
+	font: normal 20px/1 'dashicons';
 	speak: none;
 	color: #999;
-	padding: 8px 0;
-	height: 36px;
+	padding: 7px 0;
+	height: 20px;
 	width: 20px;
 	display: inline-block;
 	-webkit-font-smoothing: antialiased;
Index: src/wp-admin/menu-header.php
===================================================================
--- src/wp-admin/menu-header.php	(revision 27236)
+++ src/wp-admin/menu-header.php	(working copy)
@@ -93,7 +93,7 @@
 				$img_class = ' svg';
 			} elseif ( 0 === strpos( $item[6], 'dashicons-' ) ) {
 				$img = '<br />';
-				$img_class = ' dashicons ' . sanitize_html_class( $item[6] );
+				$img_class = ' ' . sanitize_html_class( $item[6] );
 			}
 		}
 		$arrow = '<div class="wp-menu-arrow"><div></div></div>';