Merge pull request #12719 from overleaf/ae-navbar

Restore z-index of .navbar-main

GitOrigin-RevId: f25b462227beaee483199043a97206ccdedfe1c0

services/web/frontend/stylesheets/components/navbar.less

@@ -84,7 +84,7 @@
 }
 
 .navbar-main {
-  z-index: 9999;
+  z-index: 1;
   .container-fluid > .navbar-collapse {
     // High specificity needed to override Bootstrap's default.
     margin: 10px 0 0;