fixed background position bug

[D4RlUS]

!!!!! STOP AND READ !!!!!

If the dropdown above says "base fork: lord/master", click "base fork" to change it to the bonsaiai.github.io on the dev branch, NOT master branch.

PR Review Checklist:

• [ ] Test search functionality on desktop
• [ ] Test search functionality on mobile
• [ ] Test filter functionality
• [ ] Test mobile header navigation
• [ ] Test desktop header navigation
• [ ] Test desktop homepage navigation
• [ ] Run npm run check-links with 0 broken links
• [ ] Run npm run write-good <files being edited> to "lint" the docs