ENGCOM-1490: [Forwardport] Fixed Overlay Problems #15082

 - Merge Pull Request #15082 from adrian-martinez-interactiv4/magento2:2.3-develop-PR-port-14963
 - Merged commits:
   1. c975f96

Author: magento-engcom-team

app/design/frontend/Magento/luma/Magento_Theme/web/css/source/_module.less

@@ -528,6 +528,7 @@
 
         .header.links {
             min-width: 175px;
+            z-index: 1000;
         }
 
         &.active {