diff --git a/data/styles/GitHub2.css b/data/styles/GitHub2.css
index 83ce9cca..b2d46c65 100644
--- a/data/styles/GitHub2.css
+++ b/data/styles/GitHub2.css
@@ -66,7 +66,8 @@ h2 {
   color: black; }
 
 h3 {
-  font-size: 18px; }
+  font-size: 18px;
+  border-bottom: 1px solid #cccccc; }
 
 h4 {
   font-size: 16px; }
@@ -314,4 +315,4 @@ kbd {
 figure figcaption {
   text-align: center;
   font-size: 12px;
-}
\ No newline at end of file
+}