diff --git a/doc/_static/css/custom.css b/doc/_static/css/custom.css
index 30d8607f9dc..711edd9936f 100644
--- a/doc/_static/css/custom.css
+++ b/doc/_static/css/custom.css
@@ -552,6 +552,7 @@ a.internal:visited code.literal {
 
 .rst-content .admonition.toggle button {
     display: inline-flex;
+    color: var(--admonition-note-title-color);
 }
 
 .rst-content .admonition.toggle .tb-icon {