🐛 Bug: A few aXe violations on the site

[JoshuaKGoldberg]

Bug Report Checklist

• I have tried restarting my IDE and the issue persists.
• I have pulled the latest main branch of the repository.
• I have searched for related issues and found none that matched my issue.

Expected

Running an accessibility scanning tool such as https://www.deque.com/axe/browser-extensions should show no reports on the website.

Actual

A few reports are happening:

• Elements must meet minimum color contrast ratio thresholds
• Links must have discernible text
• Scrollable region must have keyboard access

Additional Info

Originally filed as cgradeff/emojisplosion-site#4.