diff --git a/html.cfg b/html.cfg
index 184c61b..7cec0ab 100644
--- a/html.cfg
+++ b/html.cfg
@@ -23,7 +23,7 @@ color: \#0060DF;
 }}
 
 \Css{p, a {
-font-size: 1.2em;
+font-size: 1.2rem;
 }}
 
 \Css{p + pre {