Fix user tools zindex

jet/static/jet/css/_header.scss

@@ -38,9 +38,6 @@
 }
 
 .user-tools {
-  position: relative;
-  z-index: 2;
-
   ul {
     position: absolute;
     top: $top-height - 12px;
@@ -53,13 +50,12 @@
     list-style: none;
     display: inline-block;
     width: 175px;
-    z-index: 1;
+    z-index: 4;
 
     @include for-mobile {
       position: fixed;
       top: 0;
       right: 0;
-      z-index: 4;
       width: auto;
       max-width: 200px;
       color: $sidebar-link-color;