508 issue: encountering an issue where a black button (tab) on the nav bar blocks content in pages u

I'm encountering an issue where a black button (tab) on the nav bar blocks content in pages using Left Hand Navigation. This problem persists even when trying to expand the view, making it challenging for visually impaired users; this is not an issue for screen readers incorrectly reading text, but for visually impaired users trying to read it.