R1:b99f72216d5c

Standardize Pholio CSS

Summary: Use standard spacing and colors

Test Plan: Reload pinboard home, see correct gutters and colors

Reviewers: epriestley, btrahan

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Differential Revision: https://secure.phabricator.com/D8187