While toying around with some font sizes on my persona ikiwiki I discovered that some font sizes in the default CSS are fixed rather than relative. Here's a git patch that replaces them with relative font sizes (assuming the default 12pt/16px base font size recommended by the W3C):
+[[done]] --[[Joey]]
+
<pre>
From 01c14db255bbb727d8dd1e72c3f6f2f25f07e757 Mon Sep 17 00:00:00 2001
-From: Giuseppe Bilotta <giuseppe.bilotta@gmail.com>
+From: Giuseppe Bilotta <giuseppe.bilotta@gmail.com>
Date: Tue, 17 Aug 2010 00:48:24 +0200
Subject: [PATCH] Use relative font-sizes