Fixed cell toolbar select font size

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

@@ -1,44 +1,48 b''
 /* CSS for the cell toolbar */
 @celltoolbar-height: 29px;
 
 .celltoolbar {
     border: thin solid #CFCFCF;
     border-bottom: none;
     background : #EEE;
     border-radius : 3px 3px 0px 0px;
     width:100%;
     -webkit-box-pack: end;
     height: @celltoolbar-height;
     padding-right: 4px;
     .hbox();
     .reverse();
 }
 
 .ctb_hideshow {
     display:none;
     vertical-align:bottom;
 }
 
 /* ctb_show is added to the ctb_hideshow div to show the cell toolbar.
    Cell toolbars are only shown when the ctb_global_show class is also set.
 */
 .ctb_global_show .ctb_show.ctb_hideshow {
     display: block;
 }
 
 .ctb_global_show .ctb_show + .input_area,
 .ctb_global_show .ctb_show + div.text_cell_input
 {
     border-top-right-radius: 0px;
     border-top-left-radius: 0px;
 }
 
 .celltoolbar {
     font-size: 87%;
     padding-top: 3px;
 }
 
+.celltoolbar select {
+    font-size: 87%;
+}
+
 .celltoolbar label {
     margin-left: 5px;
     margin-right: 5px;
 }