A technical walkthrough on building an interactive cover UI component with CSS. Covers a slide-in reveal effect triggered by hover or keyboard focus, a two-layered overlay using CSS gradients and color-mix(), and a background image animation with per-biome customizable boundaries using CSS custom properties inside keyframes.
Table of contents
❦ On this pageTerminology §The slide-in effect §Styling the overlay §Animating the background §Wrapping up §Sort: