diff --git a/doc/static/acrn-custom.css b/doc/static/acrn-custom.css
index 45e1686c9..296a69d41 100644
--- a/doc/static/acrn-custom.css
+++ b/doc/static/acrn-custom.css
@@ -291,7 +291,8 @@ body {
    counter-reset: step-count;
 }
 
-div.numbered-step h2::before {
+div.numbered-step h2::before,
+section.numbered-step h2::before {
   counter-increment: step-count;
   content: counter(step-count);
   background: #cccccc;