diff --git a/admin/css/debug-toolbar/toolbar.scss b/admin/css/debug-toolbar/toolbar.scss
index 5d809874ebee..3e155d95b41a 100644
--- a/admin/css/debug-toolbar/toolbar.scss
+++ b/admin/css/debug-toolbar/toolbar.scss
@@ -302,6 +302,10 @@
         margin-left: 0;
         width: 100%;
 
+        ::before {
+            display: none;
+        }
+
         th {
             border-left: 1px solid;
             font-size: $base-size - 4;
diff --git a/system/Debug/Toolbar/Views/toolbar.css b/system/Debug/Toolbar/Views/toolbar.css
index 89555b4f7d40..fecea269766b 100644
--- a/system/Debug/Toolbar/Views/toolbar.css
+++ b/system/Debug/Toolbar/Views/toolbar.css
@@ -219,6 +219,9 @@
   margin-left: 0;
   width: 100%;
 }
+#debug-bar .timeline ::before {
+  display: none;
+}
 #debug-bar .timeline th {
   border-left: 1px solid;
   font-size: 12px;