diff --git a/admin/css/debug-toolbar/_theme-dark.scss b/admin/css/debug-toolbar/_theme-dark.scss
index ead7d02a58e3..5f68f8c20b5f 100644
--- a/admin/css/debug-toolbar/_theme-dark.scss
+++ b/admin/css/debug-toolbar/_theme-dark.scss
@@ -150,6 +150,10 @@
         .timer {
             background-color: $g-orange;
         }
+
+        .timeline-parent-open td {
+            color: $t-dark;
+        }
     }
 }
 
diff --git a/system/Debug/Toolbar/Views/toolbar.css b/system/Debug/Toolbar/Views/toolbar.css
index 8a302b4019e9..89555b4f7d40 100644
--- a/system/Debug/Toolbar/Views/toolbar.css
+++ b/system/Debug/Toolbar/Views/toolbar.css
@@ -532,6 +532,9 @@
   #debug-bar .timeline .timer {
     background-color: #DD8615;
   }
+  #debug-bar .timeline .timeline-parent-open td {
+    color: #252525;
+  }
   .debug-view.show-view {
     border-color: #DD8615;
   }
@@ -644,6 +647,9 @@
 #toolbarContainer.dark #debug-bar .timeline .timer {
   background-color: #DD8615;
 }
+#toolbarContainer.dark #debug-bar .timeline .timeline-parent-open td {
+  color: #252525;
+}
 #toolbarContainer.dark .debug-view.show-view {
   border-color: #DD8615;
 }