diff --git a/docs/docs.css b/docs/docs.css
index 74793c9..a38ce5b 100644
--- a/docs/docs.css
+++ b/docs/docs.css
@@ -102,10 +102,6 @@ summary {
   display: inline;
 }
 
-summary::-webkit-details-marker {
-    display: none;
-}
-
 details[open] summary {
   margin-bottom: 8px;
 }
diff --git a/style.css b/style.css
index cba0017..e65c9e0 100644
--- a/style.css
+++ b/style.css
@@ -266,7 +266,7 @@ button:disabled,
 }
 
 .status-bar-field {
-  box-shadow: inset -1px -1px  #dfdfdf, 
+  box-shadow: inset -1px -1px  #dfdfdf,
     inset 1px 1px #808080;
   flex-grow: 1;
   padding: 2px 3px;
@@ -695,6 +695,10 @@ ul.tree-view details[open] > summary:before {
   content: "-";
 }
 
+ul.tree-view details > summary::marker, ul.tree-view details > summary::-webkit-details-marker {
+  content: "";
+}
+
 pre {
   display: block;
   background: var(--button-highlight);