Refactor CSS to use standard Tailwind-style utility classes instead of ad-hoc rules. This eliminates a lot of single-purpose rules for specific UI elements and standardizes margins to be more consistent throughout the site. Utility classes are defined manually on an as-needed basis instead of importing Tailwind as a whole. Naming conventions mostly follow Tailwind's conventions, otherwise they follow Bootstrap. * https://tailwindcss.com/docs/ * https://getbootstrap.com/docs/5.0/utilities/spacing/