9.16 WCAG 2.1 Success Criterion 3.2.3 - Consistent Navigation
Where navigations or links are on multiple webpages, ensure they are presented consistently across all pages.
Before Rectification
The style is not consistent across multiple webpages. This could be confusing for visually impaired persons.
After Rectification
The example above shows the correct method to ensure the navigation is consistent across multiple webpages.
WCAG 2.1 Reference:
https://www.w3.org/WAI/WCAG21/Understanding/consistent-navigation