diff --git a/core/themes/olivero/css/components/header-navigation.css b/core/themes/olivero/css/components/header-navigation.css
index 30b1351173..efa7624f7c 100644
--- a/core/themes/olivero/css/components/header-navigation.css
+++ b/core/themes/olivero/css/components/header-navigation.css
@@ -107,6 +107,10 @@ html.js .header-nav {
   transition: visibility 0.2s, transform 0.2s;
 }
 
+body.toolbar-tray-open.toolbar-vertical.toolbar-fixed {
+  margin-left: 0;
+}
+
 /* Toolbar is fixed, and tray is vertical. */
 
 body.toolbar-vertical .header-nav {
diff --git a/core/themes/olivero/css/components/header-navigation.pcss.css b/core/themes/olivero/css/components/header-navigation.pcss.css
index 1171856b8c..799463e5d3 100644
--- a/core/themes/olivero/css/components/header-navigation.pcss.css
+++ b/core/themes/olivero/css/components/header-navigation.pcss.css
@@ -58,6 +58,10 @@ html.js .header-nav {
   transition: visibility 0.2s, transform 0.2s;
 }
 
+body.toolbar-tray-open.toolbar-vertical.toolbar-fixed {
+  margin-left: 0;
+}
+
 /* Toolbar is fixed, and tray is vertical. */
 body.toolbar-vertical .header-nav {
   border-top-width: calc(var(--toolbar-height) + var(--sp3));