diff --git a/css/index.css b/css/index.css
index 12009e1..6b3deb7 100644
--- a/css/index.css
+++ b/css/index.css
@@ -225,14 +225,14 @@ summary {
 }
 
 /* Handle buttons with sub-buttons in CSS instead of JS. */
-details > summary {
+.buttonlist details > summary {
 	list-style: none;
 	margin: 0;
 }
-details > summary::before {
+.buttonlist details > summary::before {
 	content: "▼";
 }
-details[open] > summary::before {
+.buttonlist details[open] > summary::before {
 	content: "▲";
 }