diff --git a/site/pluto.css b/site/pluto.css
index 1b84fbc2e..d1e247830 100644
--- a/site/pluto.css
+++ b/site/pluto.css
@@ -38,6 +38,11 @@ h3 {
   line-height: 30px;
 }
 
+h4 {
+  font-size: 20px;
+  line-height: 24px;
+}
+
 p {
   margin-top: 0;
   margin-bottom: 10px;