style(examples): remove redundant justify-content declaration (#97222)
## Summary
While reviewing the examples in the Next.js repository for potential
improvements, I noticed a redundant `justify-content` declaration in the
`.submit` styles.
## Changes
- Removed the redundant `justify-content: flex-end` declaration.
- Kept `justify-content: space-between`, which overrides the previous
declaration.
## Testing
No functional changes. This is a CSS cleanup only.
Co-authored-by: Marcos Hernanz <96699542+marcoshernanz@users.noreply.github.com>