diff --git a/docs/_assets/main.css b/docs/_assets/main.css
index 8ceb37ff..e18bf575 100644
--- a/docs/_assets/main.css
+++ b/docs/_assets/main.css
@@ -426,7 +426,9 @@ body:not(.about) .mdl-navigation__link.download > button {
   color: #c2185b;
 }
 
-.docs-text-styling h2, h3, h4 {
+.docs-text-styling h2,
+.docs-text-styling h3,
+.docs-text-styling h4 {
   font-size: 16px;
   color: rgba(0, 0, 0, 0.54);
   font-weight: 500;