diff --git a/site/source/scss/iseal.scss b/site/source/scss/iseal.scss
index 2a42617f..a41873c0 100644
--- a/site/source/scss/iseal.scss
+++ b/site/source/scss/iseal.scss
@@ -40,7 +40,7 @@ div.badge-required {
 
 // The ISEAL Branding Guidelines Version 3.0 say that headings should be bold
 // weight and primary blue color.
-h1, h2, h3 {
+h1, h2, h3, h4 {
     color: $primary;
     font-weight: 700;
 }