Merge pull request #2470 from matrix-org/bwindels/css-scrollbars

Make native scrollbars prettier

src/components/structures/AutoHideScrollbar.js

@@ -20,6 +20,7 @@ import React from "react";
 // Copyright (c) Noel Delgado <pixelia.me@gmail.com> (pixelia.me)
 function getScrollbarWidth(alternativeOverflow) {
     const div = document.createElement('div');
+    div.className = 'mx_AutoHideScrollbar'; //to get width of css scrollbar
     div.style.position = 'absolute';
     div.style.top = '-9999px';
     div.style.width = '100px';