[NIFI-6495] update drop down menu overlay panel min height

This closes #52.
diff --git a/platform/core/common/styles/_menus.scss b/platform/core/common/styles/_menus.scss
index 43d8637..4dc705a 100644
--- a/platform/core/common/styles/_menus.scss
+++ b/platform/core/common/styles/_menus.scss
@@ -26,6 +26,7 @@
     body[fds] .mat-menu-panel {
         border-radius: 2px;
         max-width: unset;
+        min-height: 40px;
     }
 
     body[fds] .mat-menu-item {