Don't go overboard with the styling

Breadcrumbs are a secondary navigation tool and should be designed to blend subtly into a webpage. They are not meant to be the most prominent element on the page. So, avoid using flashy or high-contrast colors for breadcrumbs. Such colors can draw undue attention, distracting users from the primary navigation elements and the main content of the page. 

Additionally, consider accessibility standards, specifically the Web Content Accessibility Guidelines (WCAG). These guidelines include requirements for color contrast to ensure that content is accessible to all users, including those with visual impairments.^[1]