Bug 1029016 - [Collection app] Can't interact with pinned apps when load...

...ing web results

Bug cause:
The section[role="notification"] element (progress indicator and connection message elements) covers <gaia-grid>. That's because it's a flexbox that has the same z-index as <gaia-grid>.

Solution: z-index: 2 for gaia-grid

http://bugzil.la/1029016