diff --git a/lib/styles/style.css b/lib/styles/style.css
index 15554fabee8c6d094e103d14ce21b9fdd192200f..81419161561f70a8258602d63f8fdddadd8d0356 100644
--- a/lib/styles/style.css
+++ b/lib/styles/style.css
@@ -89,6 +89,7 @@ em em.u {
 
 /* syntax highlighting code */
 .code .br0  { color: #66cc66; }
+.code .co0  { color: #808080; font-style: italic; }
 .code .co1  { color: #808080; font-style: italic; }
 .code .co2  { color: #808080; font-style: italic; }
 .code .co3  { color: #808080; }