Index: wp-admin/customize.php
===================================================================
--- wp-admin/customize.php	(revision 21003)
+++ wp-admin/customize.php	(working copy)
@@ -96,8 +96,8 @@
 
 		<div id="customize-footer-actions" class="wp-full-overlay-footer">
 			<a href="#" class="collapse-sidebar button-secondary" title="<?php esc_attr_e('Collapse Sidebar'); ?>">
+				<span class="collapse-sidebar-arrow"></span>
 				<span class="collapse-sidebar-label"><?php _e('Collapse'); ?></span>
-				<span class="collapse-sidebar-arrow"></span>
 			</a>
 		</div>
 	</form>
Index: wp-admin/css/wp-admin-rtl.dev.css
===================================================================
--- wp-admin/css/wp-admin-rtl.dev.css	(revision 21003)
+++ wp-admin/css/wp-admin-rtl.dev.css	(working copy)
@@ -1591,18 +1591,18 @@
 
 /* Collapse Button */
 .wp-full-overlay .collapse-sidebar {
-	right: auto;
-	left: 15px;
+	right: 0;
+	left: auto;
+	margin-right: 15px;
 }
 
 .wp-full-overlay.collapsed .collapse-sidebar {
-	right: auto;
-	left: -45px;
+	right: 100%;
 }
 
 .wp-full-overlay .collapse-sidebar-arrow {
-	margin-left: 0;
 	margin-right: 2px;
+	margin-left: 0;
 	background: transparent url('../../wp-admin/images/arrows.png') no-repeat 0 -108px;
 }
 
@@ -1611,11 +1611,10 @@
 }
 
 .wp-full-overlay .collapse-sidebar-label {
-	text-align: left;
-	right: auto;
-	left: 100%;
-	margin-right: 0;
-	margin-left: 10px;
+	right: 100%;
+	left: auto;
+	margin-right: 10px;
+	margin-left: 0;
 }
 
 /*------------------------------------------------------------------------------
Index: wp-admin/css/wp-admin.dev.css
===================================================================
--- wp-admin/css/wp-admin.dev.css	(revision 21003)
+++ wp-admin/css/wp-admin.dev.css	(working copy)
@@ -5353,11 +5353,12 @@
 .wp-full-overlay .collapse-sidebar {
 	position: absolute;
 	bottom: 12px;
-	right: 15px;
+	left: 0;
 	z-index: 50;
 	display: block;
 	width: 19px;
 	height: 19px;
+	margin-left: 15px;
 	padding: 0;
 	border-radius: 50%;
 	text-decoration: none;
@@ -5365,10 +5366,11 @@
 
 .wp-full-overlay.collapsed .collapse-sidebar {
 	position: absolute;
-	right: -35px;
+	left: 100%;
 }
 
 .wp-full-overlay .collapse-sidebar-arrow {
+	position: absolute;
 	margin-top: 2px;
 	margin-left: 2px;
 	display: block;
@@ -5382,12 +5384,11 @@
 }
 
 .wp-full-overlay .collapse-sidebar-label {
-	text-align: right;
 	position: absolute;
-	right: 100%;
-	color: #aaa;
+	left: 100%;
+	color: #808080;
 	line-height: 20px;
-	margin-right: 10px;
+	margin-left: 10px;
 }
 
 .wp-full-overlay.collapsed .collapse-sidebar-label {
@@ -5395,7 +5396,7 @@
 }
 
 .wp-full-overlay .collapse-sidebar:hover .collapse-sidebar-label {
-	color: #999;
+	color: #666;
 }
 
 /* Animations */
Index: wp-admin/css/customize-controls.dev.css
===================================================================
--- wp-admin/css/customize-controls.dev.css	(revision 21003)
+++ wp-admin/css/customize-controls.dev.css	(working copy)
@@ -12,6 +12,19 @@
 	margin: 0;
 }
 
+.control-section.customize-section:hover,
+.control-section.customize-section.open {
+	border-top-color: #808080;
+}
+
+.control-section.customize-section:hover {
+	border-bottom-color: #6d6d6d;
+}
+
+.customize-section.open:hover {
+	border-bottom-color: #dfdfdf;
+}
+
 .customize-section:last-child {
 	box-shadow: 0 1px 0 0px #fff;
 }
@@ -53,27 +66,26 @@
 	background-image:         linear-gradient( top, #f5f5f5, #eee );
 }
 
-.control-section .customize-section-title:hover {
-	color: #222;
-	background-color: #e6e6e6;
-	background-image: -webkit-linear-gradient( top, #e9e9e9, #e4e4e4 );
-	background-image:    -moz-linear-gradient( top, #e9e9e9, #e4e4e4 );
-	background-image:     -ms-linear-gradient( top, #e9e9e9, #e4e4e4 );
-	background-image:      -o-linear-gradient( top, #e9e9e9, #e4e4e4 );
-	background-image:         linear-gradient( top, #e9e9e9, #e4e4e4 );
+.control-section:hover .customize-section-title,
+.control-section .customize-section-title:hover,
+.control-section.open .customize-section-title {
+	color: #fff;
+	text-shadow: 0 -1px 0 #333;
+	background-color: #808080;
+	background-image: -webkit-linear-gradient( top, #808080, #6d6d6d );
+	background-image:    -moz-linear-gradient( top, #808080, #6d6d6d );
+	background-image:     -ms-linear-gradient( top, #808080, #6d6d6d );
+	background-image:      -o-linear-gradient( top, #808080, #6d6d6d );
+	background-image:         linear-gradient( top, #808080, #6d6d6d );
 }
 
 .control-section.open .customize-section-title {
-	border-bottom: 1px solid #e5e5e5;
+	border-bottom: 1px solid #6d6d6d;
 }
 
-.control-section.open .customize-section-title:hover {
-	border-bottom: 1px solid #dfdfdf;
-}
-
 .customize-section.open .customize-section-content {
 	display: block;
-	background: #fff;
+	background: #fdfdfd;
 }
 
 .customize-section-title:after {
@@ -97,6 +109,10 @@
 	border-color: #aaa transparent;
 }
 
+.control-section .customize-section-title:hover:after {
+	border-color: #eee transparent;
+}
+
 .control-section .customize-section-title:after {
 	top: 15px;
 }
@@ -293,7 +309,7 @@
 .customize-control .dropdown-status {
 	display: none;
 	max-width: 112px;
-	color: #999;
+	color: #777;
 }
 
 /*
@@ -412,7 +428,7 @@
 	padding-bottom: 4px;
 
 	color: #777;
-	background: #fff;
+	background: #fdfdfd;
 	border-color: #dfdfdf;
 	-webkit-border-radius: 3px 3px 0 0;
 	border-radius: 3px 3px 0 0 ;