diff --git a/IPython/frontend/html/notebook/static/less/tooltip.less b/IPython/frontend/html/notebook/static/less/tooltip.less
deleted file mode 100644
index e9b28a5db..000000000
--- a/IPython/frontend/html/notebook/static/less/tooltip.less
+++ /dev/null
@@ -1,167 +0,0 @@
-/**
- * Primary styles
- *
- * Author: IPython Development Team
- */
-
-/** WARNING IF YOU ARE EDITTING THIS FILE, if this is a .css file, It has a lot
- * of chance of beeing generated from the ../less/[samename].less file, you can
- * try to get back the less file by reverting somme commit in history
- **/
-
-/*
- * We'll try to get something pretty, so we
- * have some strange css to have the scroll bar on
- * the left of the left with fix button on the top right of the tooltip
- */
-
-// double slash comment are remove by less compilation
-// **
-// * Less mixins
-// **/
-
-// Four color of the background
-@c4 : rgb(247,247,247);
-@bordercolor : #BBB;
-@borderwidth : 1px;
-
-.dropshadow(){
- -moz-box-shadow:    0px 6px 10px -1px #adadad;
-  -webkit-box-shadow: 0px 6px 10px -1px #adadad;
-  box-shadow:         0px 6px 10px -1px #adadad;
-}
-
-// smoth height adaptation
-.smoothheight(@t:1s) {
-    -webkit-transition-property: height;
-    -webkit-transition-duration: 1s;
-    -moz-transition-property: height;
-    -moz-transition-duration: 1s;
-    transition-property: height;
-    transition-duration: 1s;
-}
-
-@-moz-keyframes fadeOut {
-    from {opacity:1;}
-    to {opacity:0;}
-}
-
-@-webkit-keyframes fadeOut {
-    from {opacity:1;}
-    to {opacity:0;}
-}
-
-//@keyframes fadeOut {
-//    from {opacity:1;}
-//    to {opacity:0;}
-//}
-
-@-moz-keyframes fadeIn {
-    from {opacity:0;}
-    to {opacity:1;}
-}
-
-@-webkit-keyframes fadeIn {
-    from {opacity:0;}
-    to {opacity:1;}
-}
-
-//@keyframes fadeIn {
-//    from {opacity:0;}
-//    to {opacity:1;}
-//}
-
-.tooltip a {
-    float:right;
-}
-
-/*properties of tooltip after "expand"*/
-.bigtooltip {
-    overflow: auto;
-    height: 200px;
-    .smoothheight();
-}
-
-/*properties of tooltip before "expand"*/
-.smalltooltip{
-    .smoothheight();
-    text-overflow: ellipsis;
-    overflow: hidden;
-    height:80px;
-}
-
-.tooltipbuttons
-{
-    position: absolute;
-    padding-right : 15px;
-    top : 0px;
-    right:0px;
-}
-
-.tooltiptext
-{   
-    /*avoid the button to overlap on some docstring*/
-    padding-right:30px
-}
-
-.tooltip {
-    max-width:700px;
-    border-radius: 4px;
-    .dropshadow;
-    /*fade-in animation when inserted*/
-    -webkit-animation: fadeOut 800ms;
-    -moz-animation: fadeOut 800ms;
-    animation: fadeOut 800ms;
-    -webkit-animation: fadeIn 800ms;
-    -moz-animation: fadeIn 800ms;
-    animation: fadeIn 800ms;
-    vertical-align: middle;
-    background-color: @c4;
-    
-    overflow : visible;
-    border: @bordercolor @borderwidth solid;
-    outline: none;
-    padding: 3px;
-    margin: 0px;
-    padding-left:7px;
-    font-family: monospace;
-    min-height:50px;
-    position: absolute;
-}
-
-
-.pretooltiparrow {
-  left: 0px;
-  margin: 0px;
-  top: -16px;
-  width: 40px;
-  height: 16px;
-  overflow: hidden;
-  position: absolute;
-
-}
-
-.pretooltiparrow:before {
-  background-color : @c4;
-  border : @borderwidth @bordercolor solid; 
-  z-index:11;
-  content: "";
-  position: absolute;
-  left: 15px;
-  top: 10px;
-  width: 25px;
-  height: 25px;
-  @theta : 45deg;
-  -webkit-transform: rotate(@theta);
-  -moz-transform:    rotate(@theta);
-  -ms-transform:     rotate(@theta);
-  -o-transform:      rotate(@theta);
-}
-
-.tooltip.hide
-{
-    -webkit-animation: fadeOut 800ms;
-    -moz-animation: fadeOut 800ms;
-    animation: fadeOut 800ms;
-    opacity : 0;
-}