Hotfix for homepage on mobile
Created by: francisschmaltz
Fix Issues #289 (closed) #290 (closed) #291 (closed)
This updates the site on mobile to address small UI issues related to large list repos on sourcegraph.com.
- Updates padding on hero section
- Sets max height for search suggestions on hero and modal
- Sets max width for suggestions on mobile
- Centers loading spinner in search bar on modal