Fix: Modal Layout Shift

Because

Fixes layout shift that occurs when opening a modal.

Fixes layout shift that occurs specifically on mobile devices when opening a modal by updating pr-4 to sm: p-4

This PR Closes #4481

[x] I have thoroughly read and understand The Odin Project Contributing Guide
[x] The title of this PR follows the keyword: brief description of change format, using one of the following keywords:
- Feature - adds new or amends existing user-facing behavior
- Chore - changes that have no user-facing value, refactors, dependency bumps, etc
- Fix - bug fixes
[x] The Because section summarizes the reason for this PR
[x] The This PR section has a bullet point list describing the changes in this PR
[x] I have verified all tests and linters pass after making these changes.
[x] If this PR addresses an open issue, it is linked in the Issue section
[ ] If applicable, this PR includes new or updated automated tests