[web] [fix] chevron size + plus spacing

Summary:
adjust chevrons for padding, additonally, removed a wrapping div because it was causing an additonal 3-4px of bottom padding throwing off the alignment of the chevrons

before:

Test Plan:
match figma + centered. I have an unrelated diff addressing the color of the chevron being incorrect. https://phabricator.ashoat.com/D3327

https://www.figma.com/file/a1nkbWgbgjRlrOY9LVurTz/?node-id=1170%3A77104

Reviewers: atul, ashoat

Reviewed By: atul, ashoat

Subscribers: ashoat, palys-swm, Adrian, karol-bisztyga

Differential Revision: https://phabricator.ashoat.com/D3330