diff --git a/IPython/html/static/notebook/less/variables.less b/IPython/html/static/notebook/less/variables.less
index 01d6ab2..0d5540c 100644
--- a/IPython/html/static/notebook/less/variables.less
+++ b/IPython/html/static/notebook/less/variables.less
@@ -1,10 +1,10 @@
 
 // Our own variables for this page
 
-@cell_selected_background: 		darken(@bodyBackground, 2%);
-@cell_background: 				darken(@bodyBackground, 3.2%);
-@border_color:					darken(@cell_selected_background, 31%);
-@light_border_color:			darken(@cell_selected_background, 17%);
-@border_width:					1px;
+@cell_selected_background:      darken(@bodyBackground, 2%);
+@cell_background:               darken(@bodyBackground, 3.2%);
+@border_color:                  darken(@cell_selected_background, 31%);
+@light_border_color:            darken(@cell_selected_background, 17%);
+@border_width:                  1px;
 @code_padding:                  0.4em;