diff --git a/html/header.html b/html/header.html
index 215f57c..268e66a 100644
--- a/html/header.html
+++ b/html/header.html
@@ -47,6 +47,7 @@
         h1::before,
         h2::before,
         h3::before,
+        h4::before,
         blockquote::before,
         .footer {
             color: #9d9d9d;