Update focus outline - Accessibility review

[caw310]

Issue Description

We need to conduct a full accessibility review of the updated focus style that has been added.

VADS Focus styles: https://github.com/department-of-veterans-affairs/vads-focus-styles
Implementation notes: https://github.com/department-of-veterans-affairs/vads-focus-styles/blob/gh-pages/implementation-notes.md

Tasks

• Review focus style updates for accuracy to the implementation guide and examples.
• Review each component's focus styles.

Acceptance Criteria

• Focus styles have been tested
• Any accessibility issues have been addressed or ticket has been written with issues that need to be fixed