MC-3103: Custom Product Attributes with FullWidth Page Layout

- Force CMS pages to have zero top margin when set to the homepage

Author: davemacaulay

app/code/Magento/PageBuilder/view/frontend/web/css/source/_layout.less

@@ -3,6 +3,10 @@
 //  * See COPYING.txt for license details.
 //  */
 
+//
+//  Product -- Full Width
+//  _____________________________________________
+
 .product-full-width-section {
     padding: .5em 0;
 
@@ -32,3 +36,11 @@
         }
     }
 }
+
+//
+//  Page -- Full Width
+//  _____________________________________________
+
+.cms-index-index.page-layout-cms-full-width .nav-sections {
+    margin-bottom: 0;
+}