diff --git a/IPython/frontend/html/notebook/static/notebook/less/tooltip.less b/IPython/frontend/html/notebook/static/notebook/less/tooltip.less
index 18019ea..a0f0187 100644
--- a/IPython/frontend/html/notebook/static/notebook/less/tooltip.less
+++ b/IPython/frontend/html/notebook/static/notebook/less/tooltip.less
@@ -118,7 +118,15 @@
     position: absolute;
 
 	z-index: 2;
-
+	
+	.tooltiptext {
+		pre {
+			border: 0;
+			.border-radius(0);
+			font-size: 110%;
+			background-color: @cell_background;
+		}
+	}
 }
 
 .pretooltiparrow {
diff --git a/IPython/frontend/html/notebook/static/style/style.min.css b/IPython/frontend/html/notebook/static/style/style.min.css
index 389b438..6dd96ca 100644
--- a/IPython/frontend/html/notebook/static/style/style.min.css
+++ b/IPython/frontend/html/notebook/static/style/style.min.css
@@ -1030,6 +1030,7 @@ p.p-space{margin-bottom:10px;}
 .tooltipbuttons{position:absolute;padding-right:15px;top:0px;right:0px;}
 .tooltiptext{padding-right:30px;}
 .ipython_tooltip{max-width:700px;-webkit-animation:fadeOut 400ms;-moz-animation:fadeOut 400ms;animation:fadeOut 400ms;-webkit-animation:fadeIn 400ms;-moz-animation:fadeIn 400ms;animation:fadeIn 400ms;vertical-align:middle;background-color:#f7f7f7;overflow:visible;border:#ababab 1px solid;outline:none;padding:3px;margin:0px;padding-left:7px;font-family:monospace;min-height:50px;-moz-box-shadow:0px 6px 10px -1px #adadad;-webkit-box-shadow:0px 6px 10px -1px #adadad;box-shadow:0px 6px 10px -1px #adadad;border-radius:4px;position:absolute;z-index:2;}.ipython_tooltip a{float:right;}
+.ipython_tooltip .tooltiptext pre{border:0;-webkit-border-radius:0;-moz-border-radius:0;border-radius:0;font-size:110%;background-color:#f7f7f7;}
 .pretooltiparrow{left:0px;margin:0px;top:-16px;width:40px;height:16px;overflow:hidden;position:absolute;}
 .pretooltiparrow:before{background-color:#f7f7f7;border:1px #ababab solid;z-index:11;content:"";position:absolute;left:15px;top:10px;width:25px;height:25px;-webkit-transform:rotate(45deg);-moz-transform:rotate(45deg);-ms-transform:rotate(45deg);-o-transform:rotate(45deg);}
 .celltoolbar{border:thin solid #CFCFCF;border-bottom:none;background:#EEE;border-top-right-radius:3px;border-top-left-radius:3px;width:100%;-webkit-box-pack:end;height:20px;}