diff --git a/doc/api_assets/style.css b/doc/api_assets/style.css
index fb34bcf12a2195..408c0025c1736d 100644
--- a/doc/api_assets/style.css
+++ b/doc/api_assets/style.css
@@ -777,7 +777,7 @@ kbd {
 .js-flavor-selector:checked {
   background-image: url(./js-flavor-esm.svg);
 }
-.js-flavor-selector:not(:checked) ~ .esm,
+.js-flavor-selector:not(:checked) ~ .mjs,
 .js-flavor-selector:checked ~ .cjs {
   display: none;
 }