Fix cell toolbar

IPython/html/static/notebook/less/celltoolbar.less

@@ -7,7 +7,8 b''
     border-radius : 3px 3px 0px 0px;
     width:100%;
     -webkit-box-pack: end;
-    height:22px;
+    height:31px;
+    padding-right: 4px;
     .hbox();
     .reverse();
 }
@@ -15,11 +16,10 b''
 .ctb_hideshow {
     display:none;
     vertical-align:bottom;
-    padding-right: 2px;
 }
 
 .celltoolbar > div {
-   padding-top: 0px;
+   padding-top: 4px;
 }