diff --git a/gh.css b/gh.css
index 3151790..9c6b8a5 100644
--- a/gh.css
+++ b/gh.css
@@ -53,6 +53,11 @@
   font-family: sans-serif;
 }
 
+h3, h4, h5, h6, h7, h8 {
+  margin-top: 1.75em;
+  margin-bottom: 0.5em;
+  font-size: 100%;
+}
 
 /* ---------------------------------------- */
 /* Table of contents, inline */