[fix] [admin menu] [z-index] Fixed top banner covering WordPress drop…

…down in plugin checkout

assets/scss/admin/common.scss

@@ -151,7 +151,7 @@ div.fs-notice
     background: rgb(235, 253, 235);
     padding:    10px 20px;
     color:      green;
-    z-index:    9999;
+    z-index:    9989; // 1 less than WordPress' #adminmenuwrap
     box-shadow: 0 2px 2px rgba(6, 113, 6, 0.3);
     opacity: 0.95;