Apply styling to grid

Screenshot: https://screenshot.googleplex.com/8ip2QAavgHmLbcS.png
Screenshot (large display size, 4th option available upon scrolling): https://screenshot.googleplex.com/5fMWNR2A9qdF4zf.png

Not restricting the preview height by preview_pager_max_height or dimen/preview_pager_maximum_height_ratio yielded better and more consistent results at different display sizes.

Bug: 181103476
Test: Manual & Build pass
Change-Id: I8212277b0cb46d0fc74b5e8eedd937ab3a216418