Issue #3316767 by agami4: Improve z-index styles for the region content

assets/css/layout--sky.css

@@ -2,6 +2,10 @@
   z-index: 10;
 }
 
+.socialblue--sky .layout--with-complementary.sidebar-left > .region--content {
+  z-index: 1;
+}
+
 .socialblue--sky .region--secondary-navigation {
   width: 100%;
   padding: 0;

components/05-templates/layout/layout--sky.scss

@@ -21,6 +21,8 @@
     }
 
     > .region--content {
+      z-index: 1;
+
       @include for-desktop-up {
         padding-left: 1rem;
         padding-right: 0;