Tailwind CSS Animated is an npm library that extends Tailwind CSS with a comprehensive set of animation utilities and 19 predefined keyframe animations. It provides utility classes for animation duration, delay, direction, iteration count, timing function, fill mode, play state, and composition, plus ready-to-use animations such as wiggle, shake, fade, flip, jump, and rotate. The package is dual-version: it ships a CSS-first implementation using Tailwind v4's @utility and @theme directives (src/utilities/*.css, src/index.css), alongside a legacy JavaScript plugin (src/compat/*.js, src/index.js) that works with Tailwind v3's plugin API. The architecture cleanly separates the v4 CSS utilities from the v3 compatibility layer, sharing a single theme definition in src/compat/theme.js.
Ultrachromic is a CSS theme for the Jellyfin media server that provides a modular system of CSS overrides to customize the appearance of the Jellyfin web interface. It consists of multiple CSS files that can be imported in a specific order to build a theme, including base styling, accent colors, rounding, progress bars, and various visual effects. The theme uses CSS variables for easy customization and includes presets that replicate the appearance of older chromic themes. It demonstrates good use of modern CSS features such as CSS variables, animations, backdrop-filter, and media queries.