I suggest the attached change for verbatim contents.  Paddings/margins are
optional, but IMHO, we should at least define a monospace font.

-- Recai (via email)

AFAICS, my web browser already has a built-in monospace font, which I can
see in action in the preformatted patch below. So I don't see why the
default style sheet should do this. --[[Joey]]

[[!tag patch]]

<pre>
diff --git a/basewiki/style.css b/basewiki/style.css
index 6ec6f89..1970561 100644
--- a/basewiki/style.css
+++ b/basewiki/style.css
@@ -198,3 +198,15 @@ li.L7 {
 li.L8 {
 	list-style: upper-alpha;
 }
+
+/* verbatim content */
+pre, tt, code {
+	font-family: "Courier", monospace;
+	color: black;
+}
+
+pre {
+	margin-left: 1.5em;
+	padding: 0.5em;
+	overflow: hidden;
+}
</pre>