fix(contentBox): z-index is placed on before instead of the relative …

…content-box-inner

- otherwise when you get the search or menu mega menu you will see part of
  the icons from the items with icons section

theme/themes/eea/extras/contentBox.less

@@ -16,6 +16,7 @@
   margin-right: -50vw;
   left: 50%;
   right: 50%;
+  z-index: @contentBoxBeforeZIndex;
 }
 
 .content-box {
@@ -28,7 +29,6 @@
     padding-top: @contentBoxContainerMarginTop;
     padding-bottom: @contentBoxContainerMarginBottom;
     position: relative;
-    z-index: @contentBoxContainerZIndex;
   }
 
   &.primary {

theme/themes/eea/extras/contentBox.variables

@@ -8,6 +8,7 @@
 @contentBoxBackgroundColor: @grey-1;
 @contentBoxNoBackground: transparent;
 @contentBoxColorInverted : inherit;
+@contentBoxBeforeZIndex: -1;
 
 /* Themes */
 @contentBoxBackgroundColorPrimary: @primaryColor;