Sometimes you may want to use the pages in your top-level navigation menu as "containers" to organize related subpages on your website. You may however not have a lot of meaningful content available for these "container" pages
Landing on an empty page can create a poor navigation experience for your viewers. To help make sure your viewers have a great and intuitive viewing experience, we've developed a special feature that allows you to turn these types of "container" pages into a directory of the subpages below it. Simply add the tag "container" to any basic page, and a list of all subpages will appear on that page in a tiled layout.
Each tile has a default background image that will be applied automatically, but you can also add custom thumbnail images for a subpage. To add a custom thumbnail image for a given subpage, upload an image that's 360px wide by 196px tall and named "thumbnail.jpg" to the subpage in question.