diff --git a/website/src/css/custom.css b/website/src/css/custom.css
index 87ef50ea89..71cfcdcbf4 100644
--- a/website/src/css/custom.css
+++ b/website/src/css/custom.css
@@ -29,7 +29,6 @@
     --navbar-link-color: #122d33;
 }
 
-
 footer {
     --ifm-footer-link-hover-color: var(--ifm-footer-link-color);
 }
@@ -38,6 +37,11 @@ footer {
     font-size: 2.5rem !important;
 }
 
+.navbar-sidebar__back {
+    /* hide the 'back to main menu' item in the narrow menu. */
+    display: none;
+}
+
 li.theme-doc-sidebar-item-category-level-1 > div::before {
     width: 0.3em;
     height: 100%;