diff --git a/themes/doc-theme/static/css/doc-theme.css b/themes/doc-theme/static/css/doc-theme.css
index 54e60df..b6f4847 100644
--- a/themes/doc-theme/static/css/doc-theme.css
+++ b/themes/doc-theme/static/css/doc-theme.css
@@ -52,9 +52,11 @@ nav#TableOfContents {
 
 h1, h2, h3, h4 {
   color: #1E1E3C;
-  letter-spacing: 0.1em;
   opacity: 0.9;
 }
+h1, h3, h4 {
+  letter-spacing: 0.1em;
+}
 h2 {
   font-family: 'Montserrat';
 }