Remove webkit-scrollbar, webkit-scrollbar-track and `webkit-scrollbar-thumb' (#307)

* Remove `webkit-scrollbar`, `webkit-scrollbar-track` and
`webkit-scrollbar-thumb'

These values were set to non-default in `custom.css` and are
interferring
with the bibliography page (and all other pages in Chrome).

It appears they were set this way with some carousel work that never
came to fruition.

* Remove `-ms-overflow-style` from custom.css.

This was disabling subwindow scrollbars on overflow.

Author: stumbo

static/css/custom.css

@@ -58,6 +58,7 @@
   scrollbar-width: 0px;
 }*/
 
+/* Remove scrollbar css interfering with bibliography pages
 *::-webkit-scrollbar {
   width: 0;
 }
@@ -74,6 +75,7 @@
 * {
   -ms-overflow-style: none;
 }
+  */
 
 .carousel ol, .carousel li {
   list-style: none;