NOREF Center button text. Fix modal content font

[kuguarpwnz]

Proposed Changes

Center button text to match the design of the mobile button. Set Open Sans 1.3rem font as default for modal content.

Checklist

• [x] I have updated the change log
• [ ] I have updated storybook as needed
• [x] I have updated VRT baselines and included diff images above in "Proposed Changes"
• [x] I have incremented the package.json and package-lock.json version number