diff --git a/IPython/html/static/notebook/js/codecell.js b/IPython/html/static/notebook/js/codecell.js
index a40be91..0240262 100644
--- a/IPython/html/static/notebook/js/codecell.js
+++ b/IPython/html/static/notebook/js/codecell.js
@@ -123,7 +123,7 @@ define([
     CodeCell.prototype.create_element = function () {
         Cell.prototype.create_element.apply(this, arguments);
 
-        var cell =  $('<div></div>').addClass('cell border-box-sizing code_cell');
+        var cell =  $('<div></div>').addClass('cell code_cell');
         cell.attr('tabindex','2');
 
         var input = $('<div></div>').addClass('input');
diff --git a/IPython/html/static/notebook/js/textcell.js b/IPython/html/static/notebook/js/textcell.js
index b99455d..22db8a4 100644
--- a/IPython/html/static/notebook/js/textcell.js
+++ b/IPython/html/static/notebook/js/textcell.js
@@ -70,7 +70,7 @@ define([
     TextCell.prototype.create_element = function () {
         Cell.prototype.create_element.apply(this, arguments);
 
-        var cell = $("<div>").addClass('cell text_cell border-box-sizing');
+        var cell = $("<div>").addClass('cell text_cell');
         cell.attr('tabindex','2');
 
         var prompt = $('<div/>').addClass('prompt input_prompt');
diff --git a/IPython/html/static/notebook/less/cell.less b/IPython/html/static/notebook/less/cell.less
index 7984c10..8bf3f85 100644
--- a/IPython/html/static/notebook/less/cell.less
+++ b/IPython/html/static/notebook/less/cell.less
@@ -2,19 +2,18 @@ div.cell {
     border: 1px solid transparent;
     .vbox();
     .corner-all();
+    .border-box-sizing();
     border-width: thin;
     border-style: solid;
-    
+
     &.selected {
         border-color: @border_color;
     }
-    
+
     &.edit_mode {
         border-color: green;
     }
-}
 
-div.cell {
     width: 100%;
     padding: 5px 5px 5px 0px;
     /* This acts as a spacer between cells, that is outside the border */