Update Buttons to Design Spec

[namtheho]

I verified there's no existing issue for this bug.

• There are no existing issues

Current behavior

The contrast on the primary button focus in web appears to be very subtle and potentially not up to accessibility (A11Y) standards.

Screen Recording of Issue

Additional context via slack conversation

Expected behavior

Design specifications need to be reviewed and updated to ensure consistency and adherence to accessibility standards.

Specs can be found here — https://playbook.ebaydesign.tech/design-system/components/cta-button/?tab=accessibility

Skin version

Current

Device/OS/Browser info

No response

Steps to reproduce

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Relevant code block

No response

Additional context

No response

[agliga]

Keep browser defaults as much as we can
Just might need to add an outline offset.