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As requested by UX, the profile card should have a transparent
background with a border. The color switched on focus or hover.

This CL also reduces the gap on the profiles grid to be 16px in total.

Screenshots:
https://drive.google.com/file/d/1kRnl-yEAKTbuT5Jei5U5h0468BYODUpi/view?usp=sharing&resourcekey=0-xjmIvYdm0vqr64uNCT8Y2Q
https://drive.google.com/file/d/1uMuHJ_RguX0cM54UFMsUztVo6gRMWFiv/view?usp=sharing&resourcekey=0-ZXmsutBgDbe5DN9pfCGLYw

Fixed: 1167101
Change-Id: I0114a80efbcd545d19e34006ea85b3800b131fb8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2632746
Commit-Queue: Monica Basta <msalama@chromium.org>
Auto-Submit: Monica Basta <msalama@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844067}