Fix .information-board style for Safari (#4602)
Fix .information-board style for Safari (#4602)

flex-basis: 0 allows make flexbox smaller than its contents on Safari <10.

https://github.com/philipwalton/flexbugs#1-minimum-content-sizing-of-flex-items-not-honored
Arukas/mastodon,Arukas/mastodon,Arukas/mastodon,Arukas/mastodon