diff --git a/IPython/html/static/base/less/page.less b/IPython/html/static/base/less/page.less
index c5c912b..a60bf6e 100644
--- a/IPython/html/static/base/less/page.less
+++ b/IPython/html/static/base/less/page.less
@@ -33,9 +33,8 @@ div#header {
 
     .header-bar {
         width: 100%;
-        height: 0px;
-        border-bottom: 1px solid @navbar-default-border;
-        margin-bottom: -1px;
+        height: 1px;
+        background: @navbar-default-border;
     }
 
     @media print {
diff --git a/IPython/html/static/notebook/js/menubar.js b/IPython/html/static/notebook/js/menubar.js
index 82def62..cc87f06 100644
--- a/IPython/html/static/notebook/js/menubar.js
+++ b/IPython/html/static/notebook/js/menubar.js
@@ -207,7 +207,8 @@ define([
         
         // View
         this.element.find('#toggle_header').click(function () {
-            $('div#header-container').toggle();
+            $('#header-container').toggle();
+            $('.header-bar').toggle();
             that._size_header();
         });
         this.element.find('#toggle_toolbar').click(function () {
diff --git a/IPython/html/static/notebook/less/menubar.less b/IPython/html/static/notebook/less/menubar.less
index a08d7e3..915bcbd 100644
--- a/IPython/html/static/notebook/less/menubar.less
+++ b/IPython/html/static/notebook/less/menubar.less
@@ -1,6 +1,5 @@
 #menubar {
   .border-box-sizing();
-  margin-top: 1px;
 
   .navbar {
     border-top: 1px;
diff --git a/IPython/html/static/style/style.min.css b/IPython/html/static/style/style.min.css
index f89775b..33addd7 100644
--- a/IPython/html/static/style/style.min.css
+++ b/IPython/html/static/style/style.min.css
@@ -8283,9 +8283,8 @@ div#header #header-container {
 }
 div#header .header-bar {
   width: 100%;
-  height: 0px;
-  border-bottom: 1px solid #e7e7e7;
-  margin-bottom: -1px;
+  height: 1px;
+  background: #e7e7e7;
 }
 @media print {
   div#header {
@@ -10267,7 +10266,6 @@ select[multiple].celltoolbar select {
   box-sizing: border-box;
   -moz-box-sizing: border-box;
   -webkit-box-sizing: border-box;
-  margin-top: 1px;
 }
 #menubar .navbar {
   border-top: 1px;