Cleaning up Context section

[engageintellect]

Problem

• Right context area styling felt a little "off", wasn't consistent with the rest of the app.

Solution

• Add rounded corners/borders to be more consistent with the rest of the app
• Give user feedback to "clear index" button clicks
• made button text uppercase to make it more obvious that it's a button
• general cleanup

Type of Change

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update
• [ ] Infrastructure change (CI configs, etc)
• [ ] Non-code change (docs, etc)
• [ ] None of the above: (explain here)

Test Plan

manual user testing on mobile/tablet/desktop layouts

[rschwabco]

Thanks @engageintellect!