Fix error in code highlighting css
diff --git a/static/css/pygments.css b/static/css/pygments.css
index 4e365f7..7c3680e 100644
--- a/static/css/pygments.css
+++ b/static/css/pygments.css
@@ -1,6 +1,6 @@
.hll { background-color: #ffffcc }
.c { color: #408080; font-style: italic } /* Comment */
-.err { solid #FF0000 } /* Error */
+.err { color: #FF0000 } /* Error */
.k { color: #008000; font-weight: bold } /* Keyword */
.o { color: #666666 } /* Operator */
.cm { color: #408080; font-style: italic } /* Comment.Multiline */